Which phylum is most closely related to the arthropods?
A. The annelids
B. The mollusks
C. The echinoderms
D. The roundworms
Answer: D
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When the immune system is activated by a normally harmless antigen, this is called
a. an allergy. b. an innate response. c. a complement response. d. cytotoxic cell response.
The amount of light at any depth in the canopy is affected by the number of ________ above
Fill in the blank(s) with correct word
Mutations:
A: occur at the same rate for all bases. B: are always caused by mutagens. C: are of no importance to evolution. D: can arise from errors in DNA replication. E: are always deleterious.
How do the interiors of the ER, Golgi apparatus, endosomes, and lysosomes communicate with each other?
A. by fusing with one another B. by open pores that allow ions to exit and enter the organelles C. by excreting hormones and other small signaling molecules D. by small vesicles that bud off of one organelle and fuse with another E. They do not communicate with one another.