Examlex
How has the study of ancient primates and human ancestors changed over time, with respect to phylogeny and reconstruction of ancient habitats? Why did this change occur? Give an example of the understanding of the past that has been improved as scholarship itself evolved.
Radial Cleavage
A type of embryonic development in certain animals where cell divisions occur at right angles to one another, typical in deuterostomes.
Coelom
Body cavity of an animal; the method by which the coelom is formed (or lack of formation) is an identifying characteristic in animal classification.
Protostomes
A group of animals characterized by the blastopore (the first opening in the developing embryo) becoming the mouth, including groups like mollusks and annelids.
Deuterostomes
A group in the animal kingdom characterized by the development of the anus from the first opening in the embryo, with the mouth developing later.
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