Which term describes a living organism's position in the flow of energy through an ecosystem?

A. trophic level

B. food web

C. biotic factor

D. energy pyramid

Don and sarah have been living together for 20 years and have recently taken in a foster child. they've never married. what type of family do they likely have?

Resting antigen presenting cells are not able to active naïve t-cells. a. True b. False

Which is one of the most important differences between prokaryotes and eukaryotes?. A. the cytoplasm in Eukaryotes does not contain any organelles but that prokaryotes does. B. eukaryotes are much smaller than prokaryotes. C.

When estuarine water forms layers of different density that do not mix, it is called what?

How many neutrons does element x have if its atomic number is 39 and its mass number is 84?

3. List three other types of evidence that plants existed in Antarctica. (besides that there were plant fossils found)

Occlusion of the left anterior descending artery during a myocardial infarction would interrupt blood supply to which structures?

Which of the following does the human body do to maintain homeostasis? A. Think B. Reproduce C. Remove waste D. None of the above

When conducting a biology investigation, why is it important to know the safety rules and symbols?

What are the two phases of speciation?