Question

question: which of the following terms describes a collection of hollow cells that implants on the uterus wall after fertilization? answer options: select one of four blastocyst zygote fetus chorion

Explanation:

To solve this, we analyze each option:

• Blastocyst: A blastocyst is a collection of hollow cells (a blastula - like structure in mammals) that implants in the uterine wall after fertilization.
• Zygote: A zygote is a single - celled structure formed just after fertilization, not a collection of hollow cells for implantation.
• Fetus: A fetus is a later stage of embryonic development, not the structure that implants.
• Chorion: The chorion is part of the fetal membrane and not the structure that implants as a collection of hollow cells.

Answer:

A. Blastocyst