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anastassius [24]
3 years ago
13

Please help with 17 &18

Biology
1 answer:
taurus [48]3 years ago
3 0
I'm no sure on that question
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MARK AS BRAINLIEST
stellarik [79]

Explanation:

Amino acid is made of an Amino group , a Carboxyl group And an R group . there is also an additional H there .

6 0
4 years ago
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What do you think is the smallest piece that you could break sand into? Why do you think so?
Irina-Kira [14]

Answer:

Eventually sand will break into very small pieces and when mixed with ... Small rock pieces become smaller through movement, as they hit other rocks and chip away. Since sand comes from a "Mother" or source rock, it is possible to determine ... Have them sprinkle a little on the paper and find the size that the particles fit .

Explanation:

i think so because of the above reason

<em><u>hope itt helps , please mark as brainliest .</u></em>

<em><u /></em>

8 0
3 years ago
Unequal distribution of ions across a cell membrane is called what?
Alex17521 [72]

The answer is:  " a gradient " .

___________________________

Hope this helps!

Best wishes!

___________________________

8 0
3 years ago
Which of the following statements is INCORRECT concerning contractile fibers? a. When a contractile fiber reaches threshold, vol
Ivanshal [37]

Answer:

B is INCORRECT

Explanation:

Action potential in contractile cells can be divided into 3 phases

1. Rapid depolarization; caused by fast influx of sodium ions into the cells. Last a few milliseconds.

2. Plateau phase: This is a sustained positive membrane potential, after rapid depolarization, caused by a balance between calcium ion influx and slow potassium ion efflux.

3. Rapid repolarization: Eventually there's a closure of all other ion channels except the potassium ion channels causing rapid efflux of potassium ions, returning the membrane potential back to negative.

A refractory period usually occurs after undergoing an action potential. During this time no action potential can occur.

4 0
3 years ago
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Need help again ASAP
lawyer [7]

Answer:

For each ball, the crater diameter increased as the height of the ball drop increased. My conclusion is that crater diameter increases with increasing mass. Also as the height of the ball increases, so does the crater diameter. Thus crater diameter is proportional to the mass and velocity of the impactor.

Explanation:

correct me if im wrong!:-)

7 0
3 years ago
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