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garik1379 [7]
3 years ago
13

13. Which statement correctly describes the human heart? A. It has three chambers, and pumps blood directly into veins. B. It ha

s two chambers, and it is composed of cardiac muscle. C. It has three chambers, and it is composed of cardiac muscle. D. It has four chambers, and pumps blood directly into arteries. 14. An individual who has had chicken pox rarely gets this disease again. This situation is an example of A. biological control B. negative feedback C, immunity D. metamorphosis 15. The nervous system is most directly involved in A. production of blood cells B. stimulation of rapid growth movement C. elimination of body wastes D. initiation of muscle
Physics
2 answers:
Marta_Voda [28]3 years ago
8 0
Number 13 is D the heart has 4 chambers and pumps blood to the arteries and number 14 us C

yanalaym [24]3 years ago
5 0


13. D ( The left atria and ventricle and the right atria and ventricle)

14. C

15.D (With signals coming from the brain, the nervous system would most likely influence your muscular movement)

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Do the following calculation and express the final answer in
sammy [17]

Answer:

Explanation:

I got the same thing. So, i don't know but good luck

3 0
1 year ago
A rock is dropped from a height of 3,245 m. If we ignore air resistance, how fast will it be travelling after it falls for 3.4 s
Marta_Voda [28]

Answer:

<u>954.4m/s</u>

Explanation:

For a free falling object,it has constant acceleration and a changing velocity.

By using the velocity-time formula, the velocity can be obtained.

The height the rock travelled is the distance.

From,

Velocity (v) = Distance (d) / Time(t)

v = 3245m/3.4s

v = <u>954.4m/s</u>

That js the answer I got. Hope it's right.

3 0
2 years ago
The current in resistor Y is..?
Aliun [14]

(A)

Explanation:

We can see that the resistors are connected in parallel so all of them have the same voltage of 100 V. We also know that

P = VI

Since resistor Y dissipates 100 W of power, we can solve for the current as

I = \dfrac{P}{V} = \dfrac{100\:\text{W}}{100\:\text{V}} = 1.0\:\text{A}

4 0
2 years ago
M=20kg F=10N d=25m<br>Work done=?​
fomenos

w=f×d

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5 0
2 years ago
Models are particularly useful in relativity and quantum mechanics, where conditions are outside those normally encountered by h
mylen [45]

Answer:

A model is defined as a structure used to represent an object, usually of a different scale.

Explanation:

In quantum mechanics and particle physics, many of the particles are subatomic, meaning that they are smaller than atoms. This is where a model would be useful. A model could help people to visualise what the particle looks like, and in general would make it easier to understand the behaviour of such a particle.

4 0
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