For a natural ecosystem to be self-sustaining, many essential chemical elements must be?
converted to energy
changed into fossil fuels such as oil and coal
permanently removed from the environment
cycled between organisms and the environment
??
I believe it's cycled between organisms an the environment. Converted to energy doesn't make sense, changed into fossil fuels is irrelevant, and permanantly removing essential chemical elements would be downright moronic.
NATURAL HAIR PRODUCT UPDATE Part 2 oils, buttes, essential oils
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NEW PROVEN EFFECTIVE ANTI-ACNE OINTMENT TREATS ACNE SKIN BLEMISHES SCARS PIMPLES | US $15.66 | 15m |
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Double-ended Powder and Blending Brush (Goat Hair) | US $.01 | 16m |
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CZ White Gold Plate 925 Silver Engagement Ring Size/Sz 8-dbmr | US $24.99 | 18m |
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Fujifilm FinePix JX250 14.0 MP Digital Camera - Black!! BROKEN! | US $14.99 | 19m |
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NEW JOSIE MARAN Argan Oil Color Stick LOVE in FULL SIZE 0 SHIP | US $19.00 | 20m |
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The Good Marriage: How & Why Love Lasts, by Blakeslee and Wallerstein | US $4.00 | 22m |
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Jane Iredale Zap&Hide Concealer - Dark | US $12.00 | 24m |
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L'Occitane **Shea Butter Soap+Verbena Shower Gel+Almond Shower Oil+Shampoo** | US $23.99 | 25m |
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Style&co "Wildflowers" 2 Standard Shams NEW | US $14.99 | 26m |
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NEW INTELLIGENT NUTRIENTS ANTI-AGING SERUM CERTIFIED ORGANIC 1.7 fl. oz | US $54.99 | 26m |
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L'Occitane *DELUXE Gift Set* (Hand Cream+Cleansing Foam+Shampoo+Soap+Shower gel) | US $28.99 | 27m |
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Most Absorbent, Fast Drying, Ultra Soft BATH SHEET TOWEL Ever Made - Microfiber | US $38.95 | 28m |
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15 RANDOM FLAVORS CUTICLE REVITALIZER NAIL OIL PEN 350X | US $18.99 | 28m |
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Canon EOS Digital Rebel XT 8.0 MP Digital SLR Camera - Silver + Sigma 18-50 Lens | US $227.50 | 28m |
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LOT 6 HANDMADE NATURAL ARTISAN COLD PROCESS SOAP OLIVE GOAT MILK SHEA BUTTER EMU | US $7.01 | 29m |
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Young Living Essential Oils Satin Facial Scrub Mint 2 oz. | US $18.00 | 29m |
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Refillable Dispensing Powder Glitter Pump Brush (black) | US $.01 | 30m |
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PURPLE 16-PCS MAKEUP MAKE UP BRUSH SET + POUCH BRU10-01 | US $10.50 | 30m |
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WORLD #1 ACNE SOLUTIONS TREATMENT KIT plus ERASE SCARS - See Results 1st Day | US $49.20 | 31m |
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1 MLg CLEAR QUARTZ TUMBLED STONE CRYSTAL HEALING REIKI | US $.99 | 33m |
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Intense Skin MOISTURIZER- Face/Body-Cream/Lotion/Butter | US $19.50 | 34m |
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African Black Exfoliating Soap - ELIMINATE ACNE for a BLEMISH FREE COMPLEXION | US $23.95 | 34m |
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ULTRA-MOISTURIZING SOAP-Treat/Prevent ECZEMA,PSORIASIS, Dry Skin,Stretch Marks | US $18.95 | 34m |
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Elizabeth Arden Ceramide Gold Ultra Restore Capsules 30 Face &Throat/30 Eye NWOB | US $26.99 | 37m |
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Worlds Greatest Stretch Mark/Scar Reducer/Remover- Better than Lotion or Cream | US $14.95 | 37m |
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HIMALAYAN BATH SALTS IN JAR - EUCALYPTUS | US $8.95 | 38m |
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VERSACE POUR HOMME 3.4 oz Men EDT Cologne * SEALED * | US $46.00 | 38m |
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Day at the Spa Shea Butter Artisan Soap | US $3.99 | 38m |
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Josie Maran Color Stick - Love - Full size .55 oz | US $12.00 | 39m |
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Bird of Paradise Shea Butter Artisan Soap | US $3.99 | 39m |
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10pcs Manicure Black Salon Buffer Sandpaper Nail Art Tool Nail Files Double-side | US $.99 | 40m |
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Cherry Almond Shea Butter Artisan Soap | US $3.99 | 40m |
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22"BEST-QUALITY REMY CLIP IN HUMAN HAIR EXTENSIONS,LIGHTEST BLONDE 60,10PCS | US $24.99 | 40m |
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Monkey Treats Shea Butter Artisan Soap | US $3.99 | 40m |
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BRAND NEW * EVERY MAN JACK * BODY WASH *CEDARWOOD SCENT 16.9 OZ | US $6.99 | 42m |
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Duo Fibre Flat Top Face Brush (No. 02) | US $.01 | 42m |
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Lavender Rosemary Hair Butter / Pomade Dry Coarse Frizzy African American Hair | US $5.95 | 43m |
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Beauty Mud 100% Natural Facial Mask similar to Dead Sea Mud, Unique present! 2SB | US $8.00 | 43m |
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elf essential holiday mascara collection | US $15.00 | 43m |
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Modern Furniture Bed Set King 5Pc | US $999.99 | 45m |
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DVD WORKBOOK CORE Horse training riding Dressage English, western,saddle,trainer | US $45.95 | 47m |
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Mary Kay BEIGE 300~8698~TimeWise Dual Coverage Powder Foundation~New no box | US $10.00 | 47m |
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PURE ORGANIC ROOIBOS TEA 1/2 LB. LOOSE LEAF | US $9.99 | 48m |
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Citrus Ylang-ylang Hair Butter / Pomade Dry Coarse Frizzy African American Hair | US $5.95 | 49m |
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BioSlim Cookbook,Doctor's Reference Guide,Activity Planner | US $14.99 | 49m |
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Philosophy Hope in a Jar 2oz Moisturizer Oprah Limited Edt SEALED in box En | US $60.00 | 55m |
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National Audubon Society Field Guide to North American Mushrooms by Gary A.... | US $5.00 | 58m |
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100% Pure Moroccan hair & skin Argan oil - 3.4oz | US $2.50 | 58m |
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Ouidad Curl Essentials Travel Kit | US $11.02 | 59m |
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Refill for Braun CCR3 CCR2 3 Syncro Clean & Renew Charge Shaver Razor Cleaner | US $11.00 | 59m |
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Bringing Up Children: With Booklet Inside (DVD) | US $29.99 | 1h |
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ELF ESSENTIAL CLARIFYING PRESSED POWDER-TONE 3-SPICE | US $4.75 | 1h 1m |
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CLASSIC PRICKLY HEAT POWDER COOLING & REFRESHING 150gx2 | US $9.99 | 1h 1m |
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ELLGY PLUS CRACKED HEEL CREAM FOR ROUGH DRY FOOT 50 g. | US $9.99 | 1h 1m |
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Gorgeous 4mm Round Blue Topaz Stud Earrings-Sterling Silver-925-Brand New! w/box | US $79.99 | 1h 2m |
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Secrets of Self-Healing by Maoshing Ni (2008) WT63089 | US $11.05 | 1h 2m |
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SILKS PANTYHOSE - NOS BEAUTIFUL LEGS - NUDE MODEL, HOSIERY PANTI - HOSE | US $6.99 | 1h 4m |
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(70) ANTI-AGING DIAMOND GEL MASK contains COLLAGEN/ NANO ACTIVE GOLD/ PEPTIDE | US $69.95 | 1h 6m |
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60 ANTI-AGING DIAMOND/ CAVIAR/ GEL MASK COLLAGEN/ NANO ACTIVE GOLD/ PEPTIDE | US $69.95 | 1h 10m |
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25 Mylar Pro Bags 8x8 1 Quart + 25 Oxygen Absorbers 100cc Long Term Food Storage | US $9.98 | 1h 11m |