Cleavage produces the
a. zygote.
b. blastula.
c. gastrula.
d. puff.
e. third germ layer.
B
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Behavioral traits are useful in differentiating species because behaviors ____
a. are never genetically determined b. related to mating may create prezygotic isolation c. of fossilized specimens are easy to infer d. are independent of morphological characteristics e. are always learned
The central column of conductive tissue in the root system is known as a(n) ________
a. vascular cylinder b. endodermis c. epidermis d. root cortex e. pericycle
Which two factors contribute significantly to the wide ranges of genome size among eukaryotes?
What will be an ideal response?
When would an atom be least likely to form chemical bonds with other atoms?
A) The number of protons equals the number of electrons. B) The number of protons equals the number of neutrons. C) There is only one electron in the valence shell. D) The valence shell is full of electrons.