Nitrogen has the atomic number 7. An isotope of nitrogen containing eight neutrons would be:
A) Nitrogen-13
B) Nitrogen-14
C) Nitrogen-15
D) Nitrogen-16
Ans: C) Nitrogen-15
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Paleobiologists apply the ____ species concept to identify fossilized remains
a. phylogenetic b. paleontological c. genomic d. biological e. morphological
How is a stolon distinguished from a root?
a. a stolon has an epidermis-- a root does not b. a root has a cortex --- a stolon does not c. a stolon has nodes -- a root does not d. a root has vascular tissue-- a stolon does not e. a stolon has an epidermis -- a root does not
The endodermis
a. is the outer covering of the root. b. is part of the vascular tissue. c. contains the Casparian strip, which regulates the movement of substances. d. is none of the above.
One out of every 800 to 1000 infants born will have three copies of chromosome 21 (trisomy 21), a condition known as ________
Fill in the blank(s) with correct word