What is the difference between an embryo and a fetus? A. An embryo is a developing frog, and a fetus is a developing human,

B. A fetus is a newly fertilized egg, and a, embryo is the name of an organism after birth.

C. An embryo is the organism from fertilization to week 10, and a fetus is from week 10 to birth.

D. An embryo develops inside the uterus, the fetus finishes development outside the uterus,

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Why do we perceive objects as retaining their brightness under different lighting levels?

How does secondary succession differ from primary succession?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.