The human stomach needs to maintain a pH level between 1 and 2 in order to properly digest food.

What is true regarding the environment of the human stomach?

Choose 1

(Choice A)
A
It is acidic.

(Choice B)
B
It is basic.

(Choice C)
C
It is neutral.

(Choice D)
D
It can switch between being basic and acidic.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.