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aleksklad [387]
4 years ago
14

_____ % of all species that have lived on earth are now extinct.

Biology
2 answers:
konstantin123 [22]4 years ago
3 0
The answer would be D.
kherson [118]4 years ago
3 0

Answer:

The Answer is D. >99

Explanation:

Of all species that have existed on Earth, 99.9 percent are now extinct. Many of them perished in five cataclysmic events. According to a recent poll, seven out of ten biologists think we are currently in the throes of a sixth mass extinction. Some say it could wipe out as many as 90 percent of all species living today. Yet other scientists dispute such dire projections.

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A random mutation occurs and the GGA codon is changed to GGU. What effect does this substitution have on the amino acid being ca
salantis [7]

Answer:

Instead of arginine codon, proline condon would be coded.

Explanation:

GCA encodes codes for glycine while on the other hand codon to GGU, GGC, or GGG encodes for glycine.

This substitution will lead to generation of complementary code “Proline” in the complementary mRNA or DNA strand.  

The codon CCT, CCC, CCA, CCG encodes for proline. If this mutation would not have occurred then Arginine would have been encoded in the complementary codon  with base structure of CGT, CGC, CGA, CGG

3 0
4 years ago
13)
Julli [10]

Multiply 5730 years by 2 since two half-lives have gone by for carbon.

<u>Explanation</u>:

The half-life of a radioactive isotope depicts the measure of time that it takes half of the isotope in an example decay. On account of radiocarbon dating, the half-existence of carbon 14 is 5,730 years  

The half-life of carbon-14 is 5730 years.  

In this manner, after  

1 half-life there is 50 % = 1/2 of the first amount left.  

2 half-lives there is 25 % = 1/4 of the first amount left.  

25% is two half-lives.  

Every 50% of life requires 5730 years.  

So two half-lives require 2 × 5730

6 0
3 years ago
​If the sunflower seeds were modified and labeled as reduced sodium, this would mean that the reduced product has _____% less so
Margarita [4]

Answer:

25%

Explanation:

The correct answer to the given question is 25%

A sunflower seed contains 9mg of sodium in it which can be modified and reduced as per needs.

If seed of a sunflower is modified and labeled as reduced sodium than this means that the sodium in the seed of a sunflower is reduced by 25% as compared to the original seed of sunflower in which no changing was made.

5 0
3 years ago
The glucose molecule created during this process contains oxygen. Which reactant does the oxygen come from?
melisa1 [442]
Not sure... but it’s water
5 0
3 years ago
What is the aim of the study of systematics?
erastova [34]

Answer:

Its main objectives are to provide scientific names for organisms, to describe organisms, to preserve collections of organisms, to provide and apply classification systems, to help identify organisms, to determine the distributions of organisms, to investigate the evolutionary histories of organisms, and to study the ...

Explanation:

6 0
3 years ago
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