When a female has low levels of estrogen and progesterone, ________
A) she is menstruating B) she is ovulating
C) her uterus is ready to accept an embryo D) she is pregnant
Answer: A
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Each nucleotide in a strand of DNA is composed of a(n) ____________________, a(n) ____________________, and a(n) ____________________
Fill in the blank(s) with correct word
In a plant cell, all stages of cellular respiration are carried out in the cytoplasm.
a. true b. false
When molecules move through a cell membrane from an area of greater concentration to an area of lesser concentration by way of a channel protein, it is called:
A. endocytosis B. exocytosis C. facilitated diffusion D. osmosis E. simple diffusion
_______ are a type of cilia; used to move things to mouth parts; aids in feeding
Fill in the blank(s) with the appropriate word(s).