Natural selection continually operates on each species to keep up with improvements made by competing species; each species’ environment deteriorates as its competitors evolve new adaptations. This is known as

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#Question id: 5078

#5. Developmental Biology

A human blastomere is:

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#Question id: 5079

#5. Developmental Biology

The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called:

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#Question id: 5080

#5. Developmental Biology

As cleavage continues during frog development, the size of the blastomeres:

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#Question id: 5081

#5. Developmental Biology

 The vegetal pole of a frog zygote differs from the animal pole in that ________.

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#Question id: 5083

#5. Developmental Biology

Which of the following correctly displays the sequence of developmental milestones?

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#Question id: 5084

#5. Developmental Biology

The first cavity formed during frog development is the ________.