The stage of development after the morula stage is 

A. implantation.
B. blastula.
C. fertilization.
D. gastrula.


B. blastula.

Biology & Microbiology

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In terms of sex chromosomes, females have:

a. one X chromosome and one Barr body b. one X chromosome c. one X chromosome and one Y chromosome d. two active X chromosomes e. two Barr bodies

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Evidence suggests that the ________ evolved from an ancient prokaryote whose plasma membrane was infolded

a. endoplasmic reticulum and nuclear envelope b. mitochondrion c. ribosome d. chloroplast

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How does bipedalism relate to sweat glands, skin color and hair density? What will be an ideal response?

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Forbidden clones, sequestered antigens, molecular mimicry, viral infections, and immune deficiency are all potential explanations for the causes of ________ diseases.

A) Autoimmune B) Immunodeficiency C) Immune complex D) Cytotoxic

Biology & Microbiology