The feeding job, or role of an organism is it's

(talking about ecosystem)

1) contribution

2) niche

3) ecosystem

4) community

i think its contribution but i put that last quiz anr i pretty much failed it and it doesnt tell me Whats wrongs so

What is plate motion?

How have humans affected the environment?

What system maintains the pH of human blood at very near 7.4?

Sergei Winogradsky Choose one: A. discovered microbial fermentation. B. developed a pure culturing system using agar. C. identified microbes using biotechnology. D. discovered chemolithotrophs in natural environments.

Which of the following is true? A. Some substances must be dissolved in water before they can be used. B. Water is more important to some organisms. C. All organisms obtain water through food. D. Plant cells are unaffected when water is scarce.

Which of the follow conditions is associated with too much body fat. A. Bladder Cancer B. Hemochromatosis C. Gallbladder disease D. Psoriasis

All of the following prevent pathogens from entering the human body except a. red blood cells b. tears c. mucus d. skin

All cells must have energy to function. Most of the energy used by the cells in your body is produced by cellular respiration. In cellular respiration, cells use_ to release energy stored in.?

In a certain state, electricity is generated by using the earths heat. Wells drilled and natural steam is taken out through pipes. This natural steam powers the generator and the electricity generated.

Which is the main source of energy that is shown in the equation?