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2 years ago

One reason tundra plants are small and grow close to the ground is that _____.

1 answer:

6 0

Tundra biomes are either found at high latitudes or high elevations in mountains. These are both very cold environments that are dominated most of the year by snow and icy conditions. This in itself tends to stunt plant growth.

These regions, especially, tundra in the high latitudes also have very short growing seasons (3 months perhaps) and so plants can only photosynthesize and store sugars for this amount of time. High winds in these environments also tend to keep plants low to the ground.

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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

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6 0

11 months ago

I need help I will mark brainliest <br><br><br> Can someone give me the step by step answer

OLga [1]

Answer

68.6 m

Explanation:

<u>Given-</u>

Mass = 0.5 kg
Potential energy = 34.3 J

<u>To find -</u>

Height of the tree upto which the squirrel climbed.

<u>Solution-</u>

Potential energy of a body = mgh

34.3 = 0.5×h (mg = 0.5kg)

h = 34.3/0.5

= 68.6 m

Option third.

4 0

2 years ago

PLEASE HELP!!!!!

Aliun [14]

The air outside your body because when you tried to hold your breath the pressure builds and forces your body to breath by letting out the air but depending the altitude you are the pressure can change hope this helps

7 0

2 years ago

4. What type of cells are haploid?

USPshnik [31]

Answer:

A haploid is a cell with a single set of chromosomes.

7 0

2 years ago

Read 2 more answers

What should be done to correct positioning on an anteroposterior (AP) elbow with lateral rotation, when the radial head is sligh

natka813 [3]

<h2>Functions of elbow joint </h2>

Explanation:

The elbow joint should be rotated laterally.
This is because the elbow is basically a pivoted joint, however, it has the extraordinary capacity to turn the distal arm in pronation and supination
These exceptional movements, alongside a wide scope of dynamic exertional powers, incline the elbow and its structures to critical wounds, especially with tedious movements
Understanding the life systems and the physical powers of development will help in diagnosis
Hence, the right answer is "elbow joint should be rotated laterally on an (AP), when the radial head is slightly superimposed over the proximal ulna on the first effort"

8 0

2 years ago