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Natasha2012 [34]
3 years ago
7

Help please! Asap!

Biology
1 answer:
Archy [21]3 years ago
6 0
For number one, the shadows are longest at sunrise and sunset, and these are different from the ones cast at noon because they are longest and darkest. Hope this helped! I'll probably come back to help with the second one after I do more research :)
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A wildfire burns a region of a healthy grasslands ecosystem. Which climax community will MOST LIKELY arrive in the burned region
Reptile [31]

Answer:

lichens and bryophytes[secondary seccession]

Explanation:

after the wildfire, the area would bee too dry and therfore it'll lead to a xerarch succession. lichens and bryophytes would be the climax communities.

7 0
3 years ago
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Is gravel an autotroph?
harkovskaia [24]
<span>"Autotrophs are the producers in a food chain, such as plants on land or algae in water" </span>
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quizlet i]n the heart, valves are located in the heart, valves are located just between the ventricles and the arteries. just be
ser-zykov [4K]

In the heart, the valves are located between atria and ventricles and between ventricles and arteries (option D).

<h3>What are valves in the heart?</h3>

Valves are membranous partitions which permit the passage of the contents of a vessel or cavity in one direction, but stop or control the flow in the opposite direction.

Valves in the heart enforce a one-way blood flow through the heart and separate atria from ventricles, and ventricles from the large arteries that leave them.

The four valves in the heart and their location is as follows:

  1. tricuspid valve: located between the right atrium and the right ventricle
  2. pulmonary valve: located between the right ventricle and the pulmonary artery
  3. mitral valve: located between the left atrium and the left ventricle
  4. aortic valve: located between the left ventricle and the aorta.

The valves between the atria and ventricles are called atrioventricular valves or cuspid valves while those at the bases of the large vessels leaving the ventricles are called semilunar valves.

Therefore, it can be said that the valves of the heart are located between atria and ventricles and between ventricles and arteries.

Learn more about valves of the heart at: brainly.com/question/28266922

#SPJ1

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2 years ago
What is the environmental impart of coal? Please use 3+ sentences. Extra Points!
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Coal can disrupt life and air. Coal is a non reusable resource and it can make life harder. Coal can heat homes and power trains. 
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What is the definition of Polar Molecule?
4vir4ik [10]
A polar molecule has a positive and negative end because of electronegativity.
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