What defines radial symmetry?
A. Only one plane of symmetry splits the organism into equal halves.
B. Any plane of symmetry passing through the center of the organism splits it into equal halves.
C. No planes of symmetry exist; the organism cannot be split into equal halves.
D. Only four planes of symmetry passing through the center of the organism splits it into equal halves.
Answer: B
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Sites in the genome that are more susceptible to mutations are called:
A. mutation spots. B. hotspots. C. risk factors. D. genes. E. noncoding DNA.
Which of the following organs of the endocrine system secretes melatonin?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
Some scientists propose that the kingdom Protista should be broken up into several kingdoms. Which of these statements accurately supports this idea?
a. Protists are all very similar and easy to confuse b. Protista contains very diverse organisms that do not fit into the other kingdoms c. Protists are the most numerous organism on Earth d. Protista evolved before any other kingdoms
Is determined by the rate at which individuals are added to and subtracted from the population.
Fill in the blank with the corret word(s).