After gastrulation, the next event in human embryo formation is ____

a. formation of the bones
b. formation of the neural tube
c. the initiation of the heart beat
d. formation of the pharyngeal arches
e. apoptosis between fingers and toes


ANSWER: b

Biology & Microbiology

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The mucociliary blanket is found in the digestive system of mammals.

Answer the following statement true (T) or false (F)

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Describe the action of the stomata to regulate water loss in a plant

What will be an ideal response?

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Sexual selection:a

is the basis for establishing elaborate societies. b. leads to a reproductive advantage for some individuals over others of the same sex and species. c. favors monogamous mating systems. d. leads to the investment of parental care of offspring. e. is not a type of natural selection.

Biology & Microbiology

Which of these describes the type of reproduction that is most adaptive in a rapidly changing environment with many different parasitic diseases present?

A) asexual reproduction because the currently successful genotypes can reproduce quickly B) asexual reproduction, because asexual reproduction uses less energy, which leaves more for each individual to adapt to the changing environment C) sexual reproduction because the diversity of genotypes increases the likelihood that there is one which can survive in a new environment D) sexual reproduction because this type of reproduction allows the production of a greater number of offspring thus providing more individuals to take advantage of any environmental challenges presented

Biology & Microbiology