Examlex
Process of Science: Explain how we can use telescopes as time machines to directly test theories of galaxy formation.
Protostomes
A group within the animal kingdom that includes organisms in which the mouth develops from the primary embryonic opening.
Radial Cleavage
A type of embryonic development in deuterostomes where the planes of cell division are either parallel or perpendicular to the vertical axis of the embryo, resulting in the cells being positioned directly above or beside each other.
Cleavage
Series of mitotic cell divisions, without growth, that converts the zygote to a multicellular blastula.
Meiotic Cell Divisions
A type of cell division that reduces the chromosome number by half, leading to the production of gametes in sexual reproduction.
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