Rotifers take their name from ____
a. their tumbling movements through the water
b. actions of cilia on their head
c. their radial symmetry
d. their elaborate digestive system
e. rotational action around the central body axis
ANSWER: b
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a. Less than 4 minutes. b. 10 minutes. c. 14 minutes. d. More than 8 minutes but less than 20. e. 5 minutes
The total collection of alleles in a population at any one time makes up that population's ________
A) gene pool B) genotype C) heterozygote frequency D) allele frequency
Marsupials are egg-laying mammals
Indicate whether the statement is true or false
What molecules are released by activated helper T cells?
A. Cytokines B. Antibodies C. Immunoglobulins D. Antigens