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suter [353]
3 years ago
14

Samuel tripped while playing basketball and skinned his knee on the concrete. Many of the skin cells on that knee were killed or

removed entirely, leaving his knee open and unprotected. Eventually, his knee scabbed over, and when the scabs fell off, there was new skin underneath. Where did the new skin come from? A. Extra skin cells from other parts of Samuel's body were moved to the injury. B. Existing skin cells near the injury reproduced to make new cells. C. Skin cells near the injury increased in size to cover the injury. D. Existing cells near the injury changed into skin cells to cover the injury.
Physics
1 answer:
kvv77 [185]3 years ago
3 0
The answer is B. Old cells need to create new cells to replenish the ones that were lost.
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Nancys airplane trip took 4 hour. For one-fourth of that time, the airplane flew at a speed of 880 km/h, it flew at a speed of 6
9966 [12]
So for a minute lets ignore the 880 km/h. If it took 4 hours and she flew at 600 km/h 600*4=2400. Now lets Look at the 880 bit. If it took 4 hours and she where to fly at 880 it would've been 880*4=3520. Lets do 2400-600=1800, now we've got the 600 kmh bit done. Now lets see if you fly 880 km/h for one hour then you add 1800+880=2680. 

Remember to thank and rate people who help you!
4 0
3 years ago
Somebody please help I need exuse to not go to pe because I injured my self anybody know what to say
algol13

Answer:

Say you feel like you twisted ur ankle or can move your foot or something in that category

3 0
2 years ago
The moment of water from ocean through the atmosphere and back
melisa1 [442]

The water cycle is all about storing water and moving water on, in, and above the Earth. Although the atmosphere may not be a great storehouse of water, it is the superhighway used to move water around the globe. Evaporation and transpiration change liquid water into vapor, which ascends into the atmosphere due to rising air currents. Cooler temperatures aloft allow the vapor to condense into clouds and strong winds move the clouds around the world until the water falls as precipitation to replenish the earthbound parts of the water cycle. About 90 percent of water in the atmosphere is produced by evaporation from water bodies, while the other 10 percent comes from transpiration from plants.

There is always water in the atmosphere. Clouds are, of course, the most visible manifestation of atmospheric water, but even clear air contains water—water in particles that are too small to be seen. One estimate of the volume of water in the atmosphere at any one time is about 3,100 cubic miles (mi3) or 12,900 cubic kilometers (km3). That may sound like a lot, but it is only about 0.001 percent of the total Earth's water volume of about 332,500,000 mi3 (1,385,000,000 km3), If all of the water in the atmosphere rained down at once, it would only cover the globe to a depth of 2.5 centimeters, about 1 inch.

6 0
3 years ago
Read 2 more answers
On the earth, when an astronaut throws a 0.250 kg stone vertically upward, it returns to his hand a time T later. On planet X he
Igoryamba

Answer:\frac{g}{2}

Explanation:

Given

mass of stone\left ( m\right )=0.250 kg

Let initial velocity with which it is thrown upward is u

therefore after time t it's velocity is zero at highest point

t=\frac{u}{g}

where g= gravity at earth

therefore T=2\times \frac{u}{g}-------1

Now same thing is done in Planet X where gravity is g'

therefore time taken by stone to reach surface is

T'=T=2\times \frac{u}{g'}-------2

Divide 1 & 2

\frac{T}{T'}=\frac{g'}{g}

\frac{1}{2}=\frac{g'}{g}

g'=\frac{g}{2}

8 0
3 years ago
Explain how oxygen is obtained by most complex organisms and then used during cellular respiration.(Please help quick)​
lisov135 [29]

Answer:complex

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Question

Discuss the importance of oxygen to all living organisms, and describe how three different organisms—human, flatworm, and fern—obtain the oxygen they need.

Answer · 38 votes

(Question 1):Oxygen is the key for generating energy in cellular respiration. The cellular respiration is a complex biological process that breaks down sugars, fat and proteins and transforms these materials into energy for the functioning of the organism. Oxygen is needed at the end of this process, when electrons liberated in the respiration are transported through the inner membranes of the cells, and the oxygen "attracts" these electrons (like bees to honey) and makes possible the production of great quantities of chemical energy in the said membranes.(Question 2):Earth's natural bodies of water have a low oxygen concentration--much lower than the level of oxygen in air at the earth's surface. Smaller organisms can obtain sufficient oxygen through the skin (e.g. flatworms), but larger organisms require special structures to collect enough oxygen to sustain life. This oxygen comes from molecules of oxygen gas dissolved in the water. The oxygen atom present in the water molecule is n…

MoreExplanation:thats it!!!! i <em>guessed∦∩⊕</em>

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