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oksano4ka [1.4K]
3 years ago
8

1. Over time, the fish and crab populations have:

Biology
2 answers:
saveliy_v [14]3 years ago
8 0
D. It fluctuates up and down because there also lots of other fish that are giving birth and having babies and having more and more and then there are people that are also catching them and eating them or selling them
Marta_Voda [28]3 years ago
5 0

1-D

2-A

this is due to pollution

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In a genetic cross between two flowering plants that are heterozygous for the color trait, red flowers (R) are dominant to white
Sedaia [141]
Draw a punnet square:
R. r.
R. RR. Rr
r. Rr. rr

Any combo that results in an R results in red flowers.

3/4 offspring have red flowers.
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3 years ago
Why do living things depend on diffusion?
mylen [45]
Living organisms obtain many of their requirements by diffusion. They also get rid of many of waste materials in this way. For example, Plants need carbon dioxide for photosynthesis. This diffuses from the air into the leaves through the stomata. It does this because there is a lower concentration of carbon dioxide inside the leaf as the cells are using it up. Outside the leaf in the air, there is a higher concentration. Carbon dioxide molecules therefore diffuse into the leaf down this concentration gradient :)
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3 years ago
What would happen to a plant cell in a hypotonic solution
mash [69]
<h2>Answer:</h2>

<u>When a plant cell is placed in a hypo-tonic solution It becomes turgid and hard.</u>


<h2>Explanation:</h2>

A hypotonic solution refers to a solution that has less solute and more water than another solution. When the plant cell is placed in a hypotonic solution, it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting. The plant cell is said to have become "turgid" i.e. swollen and hard. The pressure inside the cell rises until this internal pressure is equal to the pressure outside.

4 0
3 years ago
All of the following protect the skin and mucous membranes from infection except
leva [86]

The question is incomplete. Th ecomplete question is as following:

All of the following protect the skin and mucous membranes from infection EXCEPT  

A) multiple layers of cells.

B) tears.

C) saliva.

D) HCl.

E) the "ciliary escalator."

Answer: D) HCl.

Explanation:

  • The epidermis, the outer layer of the skin provides waterproofing and serves as a barrier to infection and other laers also sustain any type of injury.  
  • Tears wash out foreign bodies which enter the eye. In addition, tears contain a substance called lysozyme which has an antibacterial function and works to prevent microbial invasion and infection.  
  • Saliva protects against infection, especially via the innate immune system. This mechanism is an important first-line protection against bacterial and viral infection
  • The mucociliar escalator is within the conducting airways and is composed of mucus and cilia that transfer the mucus up and out of the lungs where it can be removed by coughing or swallowing,

Whereas HCL helps in the digestion process.

Hence, the correct option is D.

5 0
3 years ago
Why must all chemical reactions be balanced?
makvit [3.9K]

so that it follows the law of conservation of mass.

have a goed day

6 0
3 years ago
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