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Nimfa-mama [501]
3 years ago
9

Stars change over millions of years.O TrueO False​

Biology
1 answer:
SCORPION-xisa [38]3 years ago
8 0

Answer:

true

Explanation:

stars can change bc Stars change over time. ... It is in the clouds of dust and gas that stars are born. As more and more of the gas (which is mostly hydrogen) is pulled together by gravity into a cloud, the cloud starts to spin. The gas atoms start to bump into each other faster and faster.

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Biology help!!
ser-zykov [4K]
Genetic variation is the answer to ur question
5 0
3 years ago
Some homeostatic imbalances cause a variable that is normally controlled by negative feedback to be abnormally controlled by pos
tigry1 [53]

Answer:

True

Explanation:

Some deviations from normal homeostasis activate the positive feedback loops to control the conditions which are otherwise regulated by negative feedback mechanisms.

For example, the blood levels of respiratory gases and H+ ions are regulated by a negative feedback system via chemoreceptors. The increased partial pressure of carbon dioxide gas and lowered pH or lowered partial pressure of oxygen in the blood are sense by central and peripheral chemoreceptors which in turn activate the neurons of the dorsal respiratory group (DRG).

The activated DRG triggers an increased in the rate and depth of the breathing to facilitate the inhalation of more oxygen and exhalation of CO2 to restore the normal levels.  

However, hypocapnia inactivates the chemoreceptors and does not allow negative feedback to restore the normal CO2 levels in the blood.  

Under such conditions, the positive feedback loop stimulates the DRG neurons more strongly in response to the increased partial pressure of CO2 above the normal levels than when the partial pressure of oxygen falls below the normal level. These dangerously lowered oxygen levels may also cause fainting.  

5 0
3 years ago
Are these correct? or no?
ruslelena [56]

Answer:

yes/no

Explanation:

1. looks correct!

2. i think that is the third choice because I learned that during interphase, the cell grows and makes a copy of its DNA. I learned this a while ago so I'm not 100% sure its correct. :)

3 0
2 years ago
FILL IN THE BLANK!
ANTONII [103]

Answer: receives the thermal energy

Explanation:

The cryosphere can be defined as the land which is covered with the surface of ice in the solid form in the form of sea ice, river ice, snow, ice glaciers, ice sheets, frozen water, and others. When the ice on the land receives the thermal energy from the sun or any other source like radiation then it melts into water and it becomes the part of the water body in the form of the hydrosphere.

8 0
2 years ago
What is the density of an object that has a mass of 30g and a volume of 50cm3 ?
algol [13]

Answer:

0.6g/cm³

Explanation:

density = mass/volume

density = 30/50 = 0.6g/cm³

7 0
3 years ago
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