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algol13
3 years ago
5

Help me please I need to pass this test

Biology
2 answers:
sweet-ann [11.9K]3 years ago
4 0

Answer:

D

Explanation:

Sickle cell disease is not contagious, so you can't catch it from someone else or pass it to another person like a cold or an infection. People with sickle cell disease have it because they inherited two sickle cell genes , one from each parent.

Margarita [4]3 years ago
3 0

Explanation:

sickle cell anemia is a non communicable disease

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Natural regeneration of forests and woodlands is the process by which new trees grow from seeds that have fallen and germinate where they have fallen.  The biggest problem with natural regeneration is that is unpredictable.  As a result, it cannot be used for commercial farming. For most of the last two or three hundred years, forests and woodlands have restocked by using transplants grown in nurseries. The young trees are planted in equidistant rows. This allows each tree the best possible change of optimal growth. 
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2 years ago
How have the historic levels of melanin in human populations changed due to migration? (1 point)
MaRussiya [10]

Answer:

i would say A

Explanation:

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2 years ago
ancestors of giraffes with shorter necks could not reach branches high up in trees for food. this led to selection for longer-ne
hichkok12 [17]

With shorter necks, giraffe ancestors could not reach food-containing branches on tall trees. This resulted in the directional selection of giraffes with longer necks.

 

<h3>Why is choosing a direction necessary? </h3>

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To know more about direction selection for longer necked giraffes visit:

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7 0
1 year ago
Is the practice of genetically modifying human cells ethical? Why or why not?
kumpel [21]

It totally depends upon whether modification is being done in somatic cells or germ cells. Somatic cells modification is ethically accepted because it doesn't pass from one generation to another generation but germline modification is considered as unethical because the modification will pass on to the next generation leading to the persistence of modification in future generations. The problem with genetic modifications is that the impacts of modifications are unpredictable, rather than being fruitful they may lead to lethal mutations so if it occurs in just somatic cells, then even if it is lethal/harmful, it will be confined to only that individual but if a lethal mutation occurs in germ cells then it will pass on to the subsequent generations and it will persist in all future generations.

8 0
2 years ago
PLEASE HELP BRUH I GOT A TEST
Rzqust [24]

Answer:

4

Explanation:

Producers are at the bottom of the energy pyramid because they prove the most energy, they make up most of the population, which is biomass. And the producers have the largest population, which is why they are at the bottom of the pyramid of numbers. Finally they are at the bottom of food chains and webs because they store the most energy inside of them.

5 0
3 years ago
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