Bryophytes lack:
A) spores. B) vascular tissue. C) chlorophyll. D) gametes.
Answer: B
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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
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