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Deffense [45]
3 years ago
11

Cnidaria and flatworms exchange gases and remove wastes by way of their:

Biology
1 answer:
photoshop1234 [79]3 years ago
4 0
The answer is D, moist skin surfaces.

Explanation:
Cnidaria and flatworms respirate and extreme through their skin via diffusion.
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The antigen-binding sites of an antibody molecule are formed from the molecule's variable regions. why are these regions describ
tino4ka555 [31]

The antigen-binding sites of an antibody molecule are formed from the molecule's variable regions which are described as so because their amino acid sequences can be different on different antibodies.

The specificity of antibodies is determined by the variable regions found at their endpoints. Antibodies are specialized proteins secreted by B-cells of the immune system. They are also called immunoglobulins. They contain four polypeptide chains that comprise two heavy chains and two light chains to form a Y-shaped molecule.

The variable regions, more specifically the hypervariable regions of an antibody, have a high ratio of different amino acids with the most common amino acids provided in one place. The variable region serves as the antigen-binding site while the constant region found below the variable region is determined to invade the antigen.

Antibodies are preserved in our body to identify the antigen the next time it encounters. They send the signals to the other body parts to reject the antigen and invade it.

To know more about variable regions of antibodies, refer to the following link:

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8 0
2 years ago
Which of the following is used to break things down and dispose of?
sammy [17]

Answer: Lysosomes

Explanation:

A lysosome is a membrane-bound cell organelle that contains digestive enzymes. ... They break down excess or worn-out cell parts.

8 0
3 years ago
A man's wife wakes him from his peaceful slumber to tell him that she heard a noise. As he slowly gets up to investigate, his he
zloy xaker [14]
Sympathetic nervous system
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3 years ago
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The early ancestors of the horse shown in the picture were adapted to live in tropical forests gradually the force disappeared a
irga5000 [103]
Its still there 
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8 0
3 years ago
What is the term used to describe the solid rock that lies beneath the soil?
Nonamiya [84]

Answer:

bedrock

Explanation:

In the soil is characterized by several layers, which are: humus is more abundant in the upper layer of the soil, known as the superficial layer. The layer below is called the subsoil, which is mainly composed of clay and sand. Below it is a frayed rock layer. And deep down is a solid rock layer called the bedrock.

Bedrock is the type of rock on which the soil rests. Through erosion and a weathering process, the parent rock enables the inorganic sector of the land to develop.

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3 years ago
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