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yulyashka [42]
3 years ago
14

Why are there no samples of rocks from the early Precambrian era?

Biology
1 answer:
xenn [34]3 years ago
4 0

Answer:

The correct answer is -  D. All rocks were molten in that time period.

Explanation:

The early Precambrian era began 4.6 billion years ago. The formation of eath start from this era with dust and gas. The atmosphere at that time was too hot. It was like hades. The rocks were molten and appear to like an ocean of rocks.

Due to the molten rocks, there are no samples of rock from this area as it was too hot to be formed. There were boiling sulfur and gases were everywhere.

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Which molecule is less soluble in water--a fat or a phospholipid? Why?
VladimirAG [237]
Fat is less soluble in water compared to phospholipids.
This is because, fat is made up of three molecules of fatty acids which are not polar in nature at all, thus they mixed very poorly with water.
Phospholipids on the other hand has its molecules divided into two distinct regions, the head and the tail region. The head region is hydrophillic and it is polar in nature, that is, it mixes well with water. The tail region is made up of the fatty components  and it is hydrophobic.
Because of this difference in structure, phospholipid will dissolve better in water.
4 0
3 years ago
Read 2 more answers
Why is humus important?
Sauron [17]

Answer:

D) It decreases water movement.

Explanation:

Humus is known as part of the soil formation. It is characterized by various qualities some of which include containing nutrients such as nitrogen. It is also characterized by its ability to retain water content or soil moisture. Humus is made from the decays of plants wastes such as leaves.

Hence, in this case, the correct answer is Humus is important because "It decreases water movement."

7 0
3 years ago
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A woman is heterozygous for the CF-associated gene (the alleles are represented here by the letters A and a). Assuming that meio
harkovskaia [24]

Answer:

The correct answer is C.

Explanation:

In the question, it is stated that the woman is heterozygous, which means she posseses both the dominant allele and the recessive allele (A and a). So taking this information into account, she can produce eggs given with the option C (Aa) which include both the dominant and recessive alleles.

I hope this answer helps.

4 0
3 years ago
What is a job of the skatetal system? Remove wast. Protect organs. Exchange oxygen and carbon dioxide. Deliver nutrients to the
MrRa [10]

Answer:

The correct answer is - Protect organs

Explanation:

The skeletal system is the internal frame of the body that includes all the bones and joints present in the body. There are 206 bones in the adult human skeletal system.

The major roles of the skeletal system to help in movement, support, and protecting vital organs such as hearts, stomach, lungs, brain, and other organs. It also helps in movement and providing support to the body.

4 0
3 years ago
Which hormone acts primarily on the uterus??
Monica [59]
Progesterone.
Hope this helps!
pls give Brainliest answer!
7 0
3 years ago
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