Vaginal acidity in the adult female is due to acid production by Lactobacillus acidophilus

Indicate whether the statement is true or false.


Answer: TRUE

Biology & Microbiology

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The mucosa of the digestive tract may have villi as an adaptation

Indicate whether the statement is true or false.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology