The approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.
Atmosphere:
It is a mixture of different gases around the earth. This includes Nitrogen, Oxygen, Carbon dioxide etc.
Hence, options A, B, and D are incorrect.
Therefore, the approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.
To know more about Atmosphere,
The pie chart is missing but going with how the atmospheric composition pie chart looks like in general:
A is wrong as some gases such as moisture and carbon dioxide are not elements.
B is wrong as air is not a compound.
D is wrong as air is not a pure substance.
The only answer left is C) The chart shows the percentages of pure substances in a mixture.
A shell is considered as biotic (living) because it is a hard, rigid covering of many animals such as snail, sepia, pila, turtles, sea urchins. A shell is protective outer layer of these soft bodied animals. Shells are made of calcium carbonate in the form of calcite or aragonite crystallized in an organic matrix. Shells of other animals are composed of chitin, bone or cartilage. That's why a shell is considered as biotic (living).
Answer:
The correct answer is "because it came from something living".
Explanation:
In biology, a shell is defined as a protective structure of mollusks and crustaceans. A shell is considered to be biotic because it came from something living. Shells are not in fact alive as they are made of calcium carbonate and in some cases α-chitin, two non living materials. However, since mollusks and crustaceans are living beings, shells are considered biotic.
Hope this helps.
Answer:
Law
Explanation:
A scientific law, is a statement that describes a principle of nature, they are also known as natural laws, and are generally always true.
Scientific laws are often mathematical formulas or expressions of natural events that occur, for example gravity.
Gravity is a natural event that occurs and it was put into a mathematical equation by Issac Newton
water evaporation.
c.
water precipitation.
b.
water condensation.
d.
the water cycle.
The correct answer is option option D
The movement of water from ocean to atmosphere, then land and back to the ocean. This whole process forms a cycle called as water cycle.
It assures the movement of water from land to sky and back from the sky to land. The water from the ocean and sea evaporates into the atmosphere and goes into the sky to form clouds.
These clouds causes rain (precipitation) which falls on the land and then the water flows back to the ocean.
This cycle is known as water cycle.