One of the largest seafood exporters to the united states is a. china b. brazil c. mexico d. saudi arabia

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Number and variety of living organisms includes genetic, species, and ecological types

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm