In humans, specialized cells that produce gametes are
A. germ cells.
B. somatic cells.
C. sperm cells.
D. egg cells.
E. All of the answer choices are correct.
A. germ cells.
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The complexity and variety of organic molecules is due to _____
A) the chemical versatility of carbon atoms B) the variety of rare elements in organic molecules C) the diverse bonding patterns of nitrogen D) their interaction with water E) their tremendously large sizes
Water draining from the land mixes with seawater carried in on tides in which of the following?
a. abyssal zone b. rift zone c. upwelling d. estuary e. pelagic zone
The plural for genus is ________.
A. genus B. geni C. genera. D. gena E. genae
How do mineral ions get into the xylem cells of a plant root by way of the intracellular route?
A) They travel between root cells to the xylem and then enter a xylem vessel. B) They are actively taken in to the xylem of root hairs. C) They are taken up by root hair cells and transferred from cell to cell via plasmodesmata. D) They move in solution through cell walls of the endodermis.