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Dennis_Churaev [7]
3 years ago
9

!!HELP!!!!

Biology
1 answer:
bazaltina [42]3 years ago
8 0
The greatest threats to coral reefs is the rising temperature of the oceans as a result of climate change and the acidification of the oceans due to increased levels of carbon dioxide in the atmosphere which dissolves in the ocean and forms carbonic acid.Aug 3, 2015
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<img src="https://tex.z-dn.net/?f=%5Csmall%5Cbold%5Ccolor%7Bviolet%7D%7BNeed%20%5C%3A%20help%20%5C%3A%20here%20%5C%3A%20plss%7D"
forsale [732]

Answer:

13 - D

14 - D

15 - C

Explanation:

for 13

A molecule is two or more atoms chemically combined

An example would be carbon dioxide which contains the two atoms, carbon and oxygen

Reasons its not the other answers:

Electrons, Protons and Neutrons are all parts of an atom therefore they cannot be classified as molecules.

For 14

Remember an atom is the most basic unit out of the units we are talking about

The answer would be D

Reasons its not the other answers

Water is considered to be a molecules as it contains two or more atoms (hydrogen and oxygen)

Air is considered to be a mixture as it contains oxygen and nitrogen which can be separated

Salt is considered to be a compound because salt is made up of two atoms (chloride and sodium) in which they are held up by an ionic bond

For 15

The answer would be C (III only)

Carbon hydrogen and oxygen all happen to by atoms

Reasons its not other answer choices:

Like stated previously water is considered to be a molecule therefore we can eliminate the other answer choices

Other notes:

Compounds and molecules both are combinations of two or more atoms however they are not to be mixed together

the main difference between compounds and molecules is how they are held together

Compounds are held together by ionic bonds while molecules are help up by covalent bonds

compounds and molecules  are made up of atoms that cannot be separated

Mixtures - A mix of two or more substances that can be separated

3 0
3 years ago
The lowest layer of earth's atmosphere, in which we live, is called the ________.
Igoryamba
Troposphere. 

Hope it helps! 
3 0
3 years ago
Which affect is one likely result of a forest fire
Luda [366]
One affect could be a loss of habitat for the animals that lived in that forest
6 0
2 years ago
Read 2 more answers
List several processes in cell metabolism where diffusion is important
fiasKO [112]
<span>One process wherein diffusion is important is the concentration of salt within a cell. When the salt levels are too high within the cell, salt molecules are moving via diffusion to a region of lower concentration. Another process is the movement of carbon dioxide in plant cells, where CO2 moves from regions of high concentration to regions of low concentration.</span>
8 0
3 years ago
The biological levels of organization range from a single cell all the way up to the biosphere in a highly structured hierarchy.
ELEN [110]

Answer:

B) Tissue is made of different types of cells.

D) Organs are made of different types of tissue.

Explanation:

The tissues are made of different types of cells. The organs are also made of different types of tissue. There is no need of same types of tissues to make organs. Thus, option (B) and (D) is correct answer.

7 0
3 years ago
Read 2 more answers
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