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Kay [80]
3 years ago
14

How many years did the precambrain era span

Biology
1 answer:
Vlad1618 [11]3 years ago
5 0

Answer:

Explanation:

It is estimated that the Precambrian Era lasted between 3.9 and 4 billion years. Many scientists believe that this era accounts for 90 percent of the world's history.

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According to the theory of island biogeography, which of the following is not an island ecosystem?
den301095 [7]
<span>The correct answer is b. The open ocean. The definition of an island ecosystem does not have anything to do with water, but simply refers to an ecosystem that exists as a microcosm within a far larger, separate ecosystem. The ocean has lots of separate island ecosystems within it, but it itself cannot be referred to as one.</span>
5 0
3 years ago
What can you learn about a sample from an sds-page analysis?
puteri [66]

Option <u>(c.) the purity of the protein</u>, will be the right one.

Sodium Dodecyl Sulphate provides a negative charge to each protein as a function of their molecular size. It is an anionic detergent, as well as it is there to determine the relative abundance of major proteins.

After denaturing, proteins get unfolded and gets coated with SDS detergent molecules. The SDS-PAGE technique is used for the separation of protein based on their molecular size/weight/mass.

It is so because as it identifies the proteins by its molecular weight. Therefore, SDS is used in denaturing polyacrylamide gel electrophoresis for the determination of protein molecular weight, the SDS-PAGE is a technique.

To learn more about SDS-PAGE here

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8 0
2 years ago
What is NOT an impact that an invasive non-native species has on an ecosystem?
hjlf
D!! is the correct answer bro good luck!
6 0
3 years ago
why does the meiosis produce cells with only half the amount of DNA? How does this aid in the formation of a healthy zygote?
Andreyy89
Meiosis produces cells (germ cells or gametes) with only half the DNA, or chromosomes, as normal cells (somatic cells). This is called haploid or referred to as "n" number of chromosomes. Normal body cells have doubke that, called "2n," or diploid. For humans our n = 23, so germ cells (haploid) have only 23 chromosomes, while somatic (normal body) cells have "2n" or 46 chromosomes. It is important to only carry half the number of chromosomes or DNA (n), because it is going to combine with another half (n) when sperm meets egg during fertilization. This n + n = 2n restores the diploid number of chromosomes (DNA) in a zygote, the first cell of a future embryo, fetus, and new human being.
7 0
3 years ago
A slower-than-normal heart rate is called __________.
MakcuM [25]

Answer:

B. bradycardia

Explanation:

Bradycardia, also known as slow heart rate, is usually slower than 60 beats per minute.

Hope this helps! :)

3 0
3 years ago
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