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nirvana33 [79]
3 years ago
12

Muscles which operate without your awareness are: a: voluntary b: involuntary

Biology
1 answer:
Daniel [21]3 years ago
6 0
Involuntary muscles is the answer so b
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Carbon dioxide and methane are the two most abundant gases in magma.. <br> a. True <br> b. False
uranmaximum [27]
Answer:
            The correct option is a (true).
Reason:
             Carbon dioxide and methane gas are the principle's gas  components
present in magma.
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3 years ago
A change in the sequence of nitrogen<br> bases in a gene is called a(n)
Gnesinka [82]

Answer:

mutation

Explanation:

A mutation is a change that occurs in copying a DNA sequence where the order of the proteins could be altered.

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3 years ago
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during t cell maturation, the t cells must pass two tests. first, immature t cells that can recognize mhc molecules are [ select
tatuchka [14]

During T cell maturation, the t cells must pass two tests. first, immature t cells that can recognize MHC molecules are Selection. Second, immature t cells that recognize and bind to molecules normally found in the body are Activation.

Selection is the first test that T cells must pass. During this process, immature T cells that can recognize MHC molecules are selected. MHC molecules are found on the surface of cells and are involved in antigen presentation. When T cells come into contact with MHC molecules, they are able to recognize the molecules and begin the process of selection. During selection, the T cells that recognize MHC molecules are chosen over those that do not. This helps ensure that the cells that are selected are those that can properly respond to antigens.

The second test that T cells must pass is activation. During activation, T cells that recognize and bind to molecules normally found in the body are selected. These molecules are called self-antigens and can include proteins, carbohydrates, and lipids. When T cells come into contact with self-antigens, they are able to recognize the molecules and begin the process of activation. During activation, the T cells that recognize self-antigens are chosen over those that do not. This helps ensure that the cells that are selected are those that will not attack the body’s own cells.

Learn more about self-antigens at : brainly.com/question/24468411

#SPJ4

6 0
1 year ago
Why does external fertilization typically occur much more often in aquatic animals than in terrestrial animals? _____ Select one
mestny [16]

Answer:

The correct answer is option c. "The gametes must be kept wet to avoid desiccation".

Explanation:

External fertilization is an adaption were species reproduce sexually, but there is no direct contact between the female and the male species, because the egg is fertilized outside the female's body. This adaptation occurs more often in aquatic animals because the gametes must be kept wet to avoid desiccation and allow fertilization, which occurs much more easily on aquatic environments.

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3 years ago
Which of the following changes to Earth is caused predominantly by living organisms?
sdas [7]

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D.the movement of air currents by conversation cells

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