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

Which of these statements is true concerning the hepatitis a virus (hav) ?

What can be learned by studying fossils (think in terms of ecology, what role does the environment play in the evolution of species) ?

What is overproduction? Some offspring mate with too many partners. Individuals produce offspring with too many traits. More offspring are produced than can survive. Some individuals produce more offspring than others.

What part of the brain is primarily responsible for monitoring blood glucose levels and causing chemical reactions to spur us to eat when glucose levels are low?

True or false : both Lycophytes and Pterophytes produce spores?

The primary organs of excretion are the A. heart and lungs. B. lungs and kidneys. C. kidneys and liver. D. liver and pancreas.

What is the role of DNA ligase in the elongation of the lagging strand during DNA replication? A) It synthesizes RNA nucleotides to make a primer. B) It catalyzes the lengthening of telomeres. C) It joins Okazaki fragments together.

Which type of cytoskeletal element is described as a solid

Energy related usage in the United States makes up nearly what percentage of human-caused greenhouse emissions? A 57% B 63% C 72% D 85%

One function of the chromosomes in a cell is to A. absorb light and create energy for the entire organism. B. transport proteins throughout the cell and to other cells in the body. C. provide a location for protein synthesis inside the cell. D.