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Step2247 [10]
3 years ago
13

Friction between a skateboard wheel and the surface produces             ?

Biology
1 answer:
Levart [38]3 years ago
7 0

<u>rolling friction </u>is created when you ride the skateboard on a surface, because of the wheels
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Compare and contrast life on the raft to life on the shore in huckleberry finn
SOVA2 [1]
The comparison and contrast between the raft and the shore has something to do with freedom. On the river, Huck and Jim are free from the legal, societal and cultural structures which is the opposite if they were on the shore. However, their freedom on the raft was only for a short period of time. When<span> they went back on the shore, they were once again forced to comply with the </span>laws. The<span> similarities between the raft and the shore </span>are<span> natural. They are both are connected with geographical features.</span><span> </span>
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3 years ago
The air in the thermosphere is composed of atoms of _____ that are very far apart from each other.
Llana [10]

Answer:

Explanation:

In the upper thermosphere, atomic oxygen (O), atomic nitrogen (N), and helium (He) are the main components of air.

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3 years ago
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During exercise, epinephrine and norepinephrine are released from the adrenal medulla. Epinephrine and norepinephrine have the s
matrenka [14]

Answer and explanation:

Epinephrine and norepinephrine are two hormones that are released from the adrenal medulla when the body is under stress (like during exercise, for example) as a part of the sympathetic response.

These hormones have many functions and they all work together to prepare the individual for a fight or flight response -<em> like increasing heart rate and producing bronchodilatation</em>. One of these functions is the rise of glucose levels in blood which is important for this substance to reach several tissues, like the skeletal muscle. The skeletal muscle will make use of this glucose to produce ATP and generate the required energy for muscle contraction through a process called glycolysis, which is key for the fight or flight response mentioned above.

When we exercise, glucose levels rise thanks to these hormones so the skeletal muscle can have enough energy to contract and move as we want. If the exercise is too intense or prolongued, glucose levels will drop and other fuels will be needed to sustain this activity, like stored glycogen and fat.

7 0
3 years ago
What effect would fertilizers have if they entered the st.johns river ecosystem?
galben [10]
If fertilizers  enter the St.Johns river they will result in nutrient overload, or eutrophication and harming the ecosystem of the river. The river will exceed its assimilative capacity for nitrogen and phosphorus. this will <span>deplete oxygen in the water needed by fish and reduce light that is essential to submerged vegetation. </span>
4 0
3 years ago
The body produces antibodies complementary to foreign antigens. The process by which the body comes up with the correct antibodi
lys-0071 [83]

The question is incomplete as it does not have the options which are:

  • going to a tailor and having a suit made to fit you
  • selecting a lottery prize-winner by means of a random drawing
  • going to a shoe store and trying on shoes until you find a pair that fits
  • ordering the lunch special at a restaurant without looking at the menu
  • picking out a video that you haven't seen yet

Answer:

Going to a shoe store and trying on shoes until you find a pair that fits

Explanation:

Antibodies are the immunoglobulin molecules secreted by the B cells which help the body providing the immunity as they interact with the antigen and help immune system to produce a response.

The variety of the B cells are produced by the body in response to different antigens which produce different type of antibodies. This interaction of antigen and antibodies is known as the complementation and just appear like if you are going to a shop to buys a pair of shoes and tries different shoes  to find the best shoe of best size.

Thus, the selected option is correct.

4 0
4 years ago
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