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myrzilka [38]
3 years ago
9

BrainPop Food Chain & Energy Pyramid

Biology
1 answer:
Anon25 [30]3 years ago
5 0

Answer:

Primary consumers eat only plants; secondary consumers eat other consumers

Explanation:

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which statement correctly describes how the amount of ofoxygen in the earth’s atmosphere has changed over time?
Kay [80]

Answer:

Based on the relative volumes of the gases in Earth’s atmosphere, nitrogen is actually more than 3 times more than oxygen. Because the troposphere is the lowest atmosphere layer, it contains 75 percent of the atmosphere’s mass.. From largest to smallest, Earth’s atmosphere composition contains nitrogen, oxygen, argon, CO 2 and trace gases.

Explanation:

3 0
3 years ago
The opening and closing of _____________in your heart create the lub-dub sound and prevent the backflow of blood.
iVinArrow [24]

Answer:

Heart valves or the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole and the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

Explanation:

The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole.

The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

4 0
4 years ago
2. As people age their bones become more porous, lose calcium and phosphorus and
Studentka2010 [4]

As people age there one become more porous due to loss of calcium and phosphate and osteoporosis.

<u>Explanation</u>:

Osteoporosis is a condition in which the bones become brittle and easy to break on injury which results due to the loss of calcium from the bones. Many health problems and aging can lead to the disease of osteoporosis like breast cancer, prostrate cancer, depression, rheumatoid arthritis, Sickle Cell disease, Parkinson's disease, thalassemia, and many others.

The decreased density of the bone can be detected with the help of bone density x-ray. In females osteoporosis is common after menopause in which the drop of estrogen hormone levels cause the loss of calcium absorption in the bones.

6 0
3 years ago
which statementbest describes the environmental impact of the radioactive waste produced in fission reaction
iVinArrow [24]

The impact of radioactive waste on the environment has the potential effect to be devastating if improperly stored/managed. The largest threat posed would be if radioactive waste was leaked from containment. Some waste has the potential to cause biological harm if inhaled or ingested. Leakage of radioactive material can render areas of the environment uninhabitable. Seeing as radioactive material can have a half life from hundreds of years to thousands it is imperative it is correctly contained.

5 0
4 years ago
What would be the reason that someone’s eye color would change from blue to green when they were a child?
Butoxors [25]
Your eyes don’t change color, they only reflect the colours around them in particular if they are light coloured eyes. My eyes are blue-grey with a green heterachromia. They are very sensitive to light and dust so they get red easily which makes the eye color appear a brighter blue. If I wear green, the appear more green in color, when I am sunburned they appear more turquoise, etc. But when I wear white or don’t have a shirt on, they look their true blue-grey.
3 0
3 years ago
Read 2 more answers
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