Vaginal acidity in the adult female is due to acid production by Lactobacillus acidophilus
Indicate whether the statement is true or false.
Answer: TRUE
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The mucosa of the digestive tract may have villi as an adaptation
Indicate whether the statement is true or false.
An unusual, worldwide formation of sedimentary rock called the K–Pg boundary sequence contains rare elements that
are associated with a(n) ____.
a. volcanic eruption b. worldwide flood c. Ice Age d. asteroid impact e. large earthquake
The sun shining on a tidal pool during a hot day heats the water. As some water evaporates, the pool becomes saltier, causing _____
A) an increase in its carbon dioxide content B) a decrease in its oxygen content C) an increase in its ability to sustain aerobic organisms D) a decrease in the water's density
Which extinct hominin first appeared about 1.9 million years ago and had a larger brain than Homo habilis, its immediate predecessor?
A) Homo ergaster B) Homo neanderthalensis C) Homo sapiens D) Australopithecus