Bryophytes lack:
A) spores. B) vascular tissue. C) chlorophyll. D) gametes.
Answer: B
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A population in which the allele and genotype frequencies do not change over time is said to be in:
a. genetic stasis. b. allele balance. c. genetic equilibrium. d. population stability. e. phenotype equilibrium.
Once commercial whaling stopped, whale populations quickly returned to their pre-whaling sizes
Indicate whether the statement is true or false
White blood cells have surface receptors called _________ receptors that serve as their "feelers" for foreign substances.
A) Pattern recognition B) Pathogen molecular C) Antibody recognition D) Immunogenic
What does PTH stimulate when blood calcium levels are low?
a. excretion of calcium from the kidneys b. excretion of calcium from the intestines c. osteoclasts d. osteoblasts