Please help me with these ecology questions! Thank you 21. Fertilizers provide plants with
a. nitrogen.
b. carbon.
c. water.
d. oxygen.
22. Which of the following convert(s) nitrogen from air into a form plants can use?
a. bacteria
b. lightning
c. sunlight
d. both a and b
23. Plants use nitrogen to make
a. carbohydrates.
b. nitrogen gas.
c. amino acids
d. both b and c.
24. An animal returns nitrogen to the environment when it
a. breathes.
b. decomposes.
c. urinates.
d. both b and c.
25. Animals get phosphorus from
a. the air.
b. eating plants.
c. water.
d. the soil.
26. Phosphorus in the soil comes from
a. rocks.
b. decaying organisms.
c. the air.
d. both a and b

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

d) center of the mid-ocean ridge

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steckh986

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

carbon atoms, hydrogen, oxygen, and nitrogen.