The prime culprit that produces coral bleaching
is
a. fungal infections.
b. water levels changing.
c. salinity levels changing.
d. light levels changing.
e. temperature changes
E
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The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups—Lophotrochozoa and Ecdysozoa. What does this finding suggest?
A) These two subgroups have a common ancestor that was a deuterostome. B) The protostomes are a polyphyletic group. C) Division of these two groups occurred after the protostome developmental sequence appeared. D) The lophotrochozoans are monophyletic.
Which of the following is the most likely series of events?
A. Earth formed—oxygen in atmosphere—living organisms—ozone B. Ozone—living organisms—plants—organic molecules C. Organic molecules—ozone—living organisms—oxygen in atmosphere D. Organic molecules—living organisms—oxygen in atmosphere—ozone
"She is a carrier of the cystic fibrosis trait." This statement acknowledges that this person
A. is homozygous for the trait. B. is heterozygous for the trait. C. may be trisomic. D. has two recessive alleles.
HIV infects cells by recognizing the cell-surface markers with its own
A. glycoproteins. B. capsid protein. C. reverse transcriptase. D. DNA. E. enzymes.