Which of the following animals has a gastrovascular cavity?
a. earthworm
b. fish
c. hydra
d. insect
e. sponge
C
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Among flowering plants, 30% to 80% of existing species are polyploidy somewhere within their evolutionary history
A. true B. false
What are the three components of the insect body plan?
a. Head, cephalothorax and walking legs b. Cephalothorax, walking legs and telson c. Head, thorax and tail d. Head, thorax and abdomen e. Chelicerae, abdomen and telson
Which of the following organs of the endocrine system secretes cortisol and aldosterone?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
Many cases of epigenetic modification involve adding a methyl group to the DNA in promoters, a process called
____________________. Fill in the blank(s) with the appropriate word(s).