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______________ is/are the ultimate source(s) of new alleles in a population.

apes_cladogram.jpg  Humans, chimpanzees, gorillas, and orangutans are members of a clade called the great apes, which shared a common ancestor about fifteen million years ago. Gibbons and siamangs comprise a clade called the lesser apes. Tree-branch lengths indicate elapsed time. Chimps and gorillas are humans’ closest relatives. If humans were removed from the great ape clade and placed in a different clade of their own, this would have the effect of making the phylogenetic tree of the great apes _____.

Which of these are ways humans use bacteria for our own benefit?

phylogenetic tree.png  Using the phylogenetic tree, which of the following is most closely related to species A?

Which best defines a biological species?

Which best defines a biological population?

Which class of arthropod has 2 body regions and 10-14 legs?

Which class of arthropod has 3 body regions and 6 legs?

Which of the two body forms found in cnidaria is the dominant part of the hydra life cycle?

nitrogen cycle.png Use the figure to answer the question. Consider the global nitrogen cycle depicted in the figure. What is the limiting portion of the cycle for plants?