Phosphorus can be obtained from organic sources only.
Answer the following statement true (T) or false (F)
False
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Insufficient production of acetylcholine in the synapses of the brain, abnormal tangled neurons, and large deposits of beta-amyloid are problems associated with which one of the following diseases?
A) meningitis B) Alzheimer's disease C) rabies D) Parkinson's disease E) epilepsy
If a person had the thymus gland removed, which of the following would NOT occur in his or her body?
A) production of B cells B) production of T cells C) maturation of B cells D) maturation of T cells
Damage to the integument may trigger action by cells of which system?
A. immune system B. reproductive system C. endocrine system D. muscular system
These two figures illustrate two lineages with two variants, with and without a black spot. In all situations, a split illustrates the descendants of an individual. In which situation can natural selection work?
a. In the diagram on the left, because natural selection has eliminated the spotted variant. b. In the diagram on the left, because the number of offspring produced is independent of muta-tion. c. In the diagram on the right, because variation is heritable. d. In the diagram on the right, because mutation does not influence reproduction.