What is the name of the specialized stinging cells that jellyfishes have as part of their epidermis, and which they use to paralyze small prey?
a. tentacles
b. flame cells
c. choanocytes
d. cnidocytes
Ans: d. cnidocytes
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You've been asked to stabilize a compound whose general state is altered by excess electrons. The element you would add to the compound to most effectively stabilize the compound would be? Why?
A. Carbon, because it is capable of neutralizing electrons. B. Nitrogen, because it have five electrons on its outer shell. C. Fluorine, because it is has seven electrons in its outer shell. D. Oxygen, because it can easily bind with the compound.
Explain why we say nearly all life on Earth ultimately depends on the sun for energy
What will be an ideal response?
Which of the following is true concerning the dodo bird?
a. The greatest effect by humans on the dodo bird was because Dutch sailors ate them b. The dodo bird went extinct in the twentieth century due to industrial pollution. c. Humans were not involved in their fate. d. Destruction of nests and habitat by animals that accompanied the sailors caused the greatest effect on dodo bird populations.
Which of these is a reasonable definition of a gene based on current understanding of biology?