Calcium ions are normally in higher concentrations outside most living cells than within cells. Which of the following processes is most likely responsible for this condition?
A) simple diffusion
B) facilitated diffusion
C) osmosis
D) active transport
D
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Which vertebrates rely on a positive pressure filling mechanism to move air into their lungs?
A. human B. eagle C. bullfrog D. crocodile E. mouse
In the case of a proto-oncogene like Ras, both copies of the gene must be mutated to increase a predisposition to cancer.
Answer the following statement true (T) or false (F)
Euglenids were once classified as (algae/fungi/prokaryotes).
Fill in the blank(s) with the appropriate word(s).
Based on the tree shown above, the sister group to small tree finches would be:
A. the group consisting of large and medium tree finches. B. large tree finches. C. medium tree finches. D. woodpecker finches. E. the group consisting of woodpecker and mangrove finches.