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devlian [24]
3 years ago
8

The human stomach contains acids that aid in digestion. a stomach enzyme was placed in a solution that contained no acid. why di

d the stomach enzyme not work properly?
Biology
1 answer:
gayaneshka [121]3 years ago
8 0
Because the acid helps the stomachs digestion system digest
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Plant stems can be ______, ______, thick,______, or _________.
goldenfox [79]

Answer:

Underground stem, Aerial stem, and subaerial stem.

Explanation:

Plant stems can be Underground stem, Aerial stem, and subaerial stem due to its presence and strength of the stem. Underground stem are thick stems that run below the ground surface. e.g rhizome. Aerial stems are thin stems that can not stand erect. Examples include watermelon and strawberry etc. Subaerial stems are very thin stems that do not rise up but grow just above the ground. for example, water plantain, flowering rush etc.

6 0
3 years ago
Seismic waves do not travel along the Earth’s surface.
stepan [7]

Answer:

The answer is <u>True.</u>

Explanation:

  • <u>The body waves travel in the interior of the Earth and the surface waves travel at the surface of the Earth.</u>
  • <u>8::::::::D~ D:</u>
5 0
2 years ago
Cytoplasm is a single substance like water. true false
Kay [80]
It is false that cytoplasm is a single substance like water.
It consists of 80% water, but has other elements as well. 
3 0
3 years ago
What were the two driving forces that drove the evolution in the variation of skin color
yarga [219]

Answer:

The correct answer is: geography and UV radiation.

Explanation:

Skin variation occurred thanks to evolution, and was driven as a consequence of the geographical location of different populations of humans.

The humans that lived in hot and sunny places, closer to the equator, where much more exposed to the sun's ultraviolet radiation. In order to survive the amount of UV lights that they were exposed to, new humans in those regions were being born with a darker skin tone, which was rich in melanin (a brown pigment that protects us from the sun radiation).

Contrary to these humans that lived in the tropical areas, the humans that populated the areas that were closer to the poles, developed much lighter skin as a result of lower amounts of melanin in their skin. Since sun exposure in the poles is very limited, humans needed to receive as much as they could for the production of Vitamin D, and thus, their skins got lighter and less protected.

8 0
3 years ago
Which nitrogen bases are complementary to each other
storchak [24]

Answer:

Adenine and guanine are purines, while thymine, cytosine and uracil are pyrimidines.

Hope this helps! Sorry no one answered your question sooner :(

7 0
3 years ago
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