Which answer is not a mechanism for evolution1.Mutations 2.Natural Selections3.Genetic Drift 4.Gene Pool?

Evolutionary theory contends that genetic ___________ is necessary and beneficial for humanity when there is an environmental ch

Anni [7]

Answer:

variation

Explanation:

Genetic variation is what makes us all unique as a result of subtle changes in our DNA. The Theory of Evolution is a process in which organisms change over time as a result of adapting to their environment. Charles Darwin came up with the term Survival of the fittest, in any environment plants and animals from the same species show natural variation in their physical characteristics, like neck lengths in giraffes. Darwin suggested that the plants and animals best suited to the environment will survive and pass on their characteristics to their offspring. Over time, the characteristics of the surviving members of the species will become predominant.

Example: Peppered moth

In London in the 1800's, 98% of peppered moths had light colored bodies and only 2% were dark. The light moths were the same color as the trees so they could easily hide from hungry birds and not get eaten. The dark moths however were easy to see and were eaten. Then came the factories and smoke of the industrial evolution and many trees turned black with soot and suddenly the dark moths were able to survive better as they now looked like the trees and the light colored moths were easier to spot and eat. By 1895 the dark peppered moths made up 95% of the population and the light colored moths only 5%. This is an example of natural selection, because of the gene that makes the moths dark, it allowed them to flourish when the environment changed, they adapted, reproduced and survived.

8 0

2 years ago

A geologist is studying two different rhyolite flows to determine if they were erupted at the same time.

ss7ja [257]

Q1. The answer is 1.

It can be calculated using the equation:

(1/2)ⁿ = x

x - decimal amount remaining,

n - a number of half-lives.

x = 50% = 50/100 = 0.5

n = ?

(1/2)ⁿ = 0.5

log((1/2)ⁿ) = log(0.5)

n * log(1/2) = log(0.5)

n * log(0.5) = log(0.5)

n = log(0.5)/log(0.5)

n = 1

Q10. The answer is 2.

It can be calculated using the equation:

(1/2)ⁿ = x

x - decimal amount remaining,

n - a number of half-lives.

Rhyolite #2 has 25% of the parent H remaining:

x = 25% = 25/100 = 0.25

n = ?

(1/2)ⁿ = 0.25

log((1/2)ⁿ) = log(0.25)

n * log(1/2) = log(0.25)

n * log(0.5) = log(0.25)

n = log(0.25)/log(0.5)

n = -0.602 / - 0.301

n = 2

Q3. The answer is 100 million years.

A number of half-lives (n) is a quotient of total time elapsed (t) and length of half-life (H):

n = t/H

n = 1

t = ?

H = 100 000 000 years

n = t/H

t = n * H

t = 1 * 100 000 000 years

t = 100 000 000 years

4 0

3 years ago

Whats the biggest mystery about the virus

dsp73

Explanation:

Hey, there!!

According to what i have learned, the biggest mystery about virus is; It acts like both living and non- living beings.

living characters includes :

It reproduce to make more no. of themselves. 
It feeds on various substances.

non- living characters: 

It can be crystallize. 
It dont respire and feed eith it is out from a host body.

Hope it helps...

5 0

3 years ago

Which of the following would most likely increase biodiversity?

Lapatulllka [165]

I world say national park. because farming could be taking away from the biodiversity. where as the national park planning would be trying to help the biodiversity.

4 0

3 years ago

Choose the correct answer from the list.

stich3 [128]

Answer:

1, Promoters

2.transcription bubbles

3. transcription

4. repressors

5. Primers

6. consensus sequences

Explanation:

.1. DNA sequences that direct RNA polymerase to the initiation site are called _____Promoters _________.

2. RNA synthesis complexes containing DNA, RNA, and polymerase are called ___transcription bubbles___________.

3. RNA synthesis (tRNA, mRNA, and rRNA) in general is called _______transcription_______.

4. The expression of beta-galactosidase requires the induction of operons by removal of _repressors_____________.

5. Unlike DNA synthesis, RNA synthesis does not require ___primers___________.

6. ___consensus sequences___________ are deduced by comparing many related DNA sequences.

7 0

3 years ago