All categories

3 years ago

What needed to happen before life could exist on Earth?

Biology

1 answer:

Dmitrij [34]3 years ago

3 0

Answer:

The condition of the Earth had to become favourable before it could support any form of life.

The formation of the different layers around the earth like the ozone layer was necessary before life could originate. Primitive species such as some prokaryotes were able to live in hydrothermal conditions during the initial times. With the passage of time, as the concentration of oxygen increased due to photosynthetic prokaryotes, situations became favourable for eukaryotic organisms to arise.

You might be interested in

A student puts drops of Lugol's iodine solution into the water in the beaker shown. The water turned red. After a short time, th

pantera1 [17]

Answer:

Cell membrane as a semi permeable membrane.

Explanation

A semi permeable membrane is the one that would only allow water,ions and certain molecules to pass through it by diffusion while restricting other large molecules from passing through.

Details in the attachment.

Download docx

8 0

3 years ago

Suppose the human trait for hair type is controlled by a simple dominant and recessive relationship at one locus. Curly hair, C,

myrzilka [38]

Answer:

A) The frequency of the dominant allele, C $= 0.4376$

B) frequency of the heterozygous genotype, Cc $= 0.2461$

Explanation:

Given -

Curly hair, C, is the dominant allele, and straight hair, c, is the recessive allele

Number of students with curly hair is $37$

Thus frequency of genotype "CC"

$= q^{2} = \frac{37}{117} \\= 0.3162$

Thus, frequency of allele "q"

$= \sqrt{0.3162} \\= 0.5623$

As per Hardy Weinberg's first equation-

$p+q=1$

Substituting the value of q, we get -

$p+0.5623=1\\p= 0.4376$

As per Hardy Weinberg's second equation -

$p^2+q^2+2pq=1\\$

Substituting the values of "p" and "q" we get -

$0.4376^{2} + 0.3162+2pq = 1\\2pq = 0.2461\\$

Hence,

A) The frequency of the dominant allele, C $= 0.4376$

B) frequency of the heterozygous genotype, Cc $= 0.2461$

8 0

3 years ago

Read 2 more answers

Mitosis & Meiosis: Thinking Scientifically

REY [17]

Answer:

65536 cells

Explanation:

starting from 1 cell at zero minutes there will be 1 (2^0) cell; 2^0 = 1

after 15 minutes there will be 2 (2^1) cells

after another 15 minutes ( 30 min) there will be 4 ( 2²) cells

after another 15 minutes ( 45 min) there will be 8 (2³) cells

after n number of 15 minutes there will be (2^n) cells

calculate number of 15 minutes in 4 hours

4 hours = 4 × 60 minutes

number ( n) of 15 minutes in 4 hours = (4 × 60 minutes) / 15 minute = 16

using the formula above and substitute 16 for n in the formula

Number of cells = 2 ^n = 2^16 = 65536 cells

6 0

3 years ago

The principle characteristic that differentiates temperate and tropical rain forests is ________.

Vesnalui [34]

Answer:

The difference is in the location. If the rain forest is close to the equator, it is considered tropical. If the rain forest is farther away from the equator (between the Arctic Circle and the Tropic of Cancer or the Antarctic Circle and the Tropic of Capricorn) then the forest is considered to temperate.

Explanation:

8 0

2 years ago

Read 2 more answers

An occupational disease caused by the inhalation of certain dust particles is called: dermatosis. None of these is correct. athe

yawa3891 [41]

Answer:

pneumoconiosis

Explanation:

Dermatosis is a condition of the skin, either genetic in nature and influenced by environmental conditions such as an initial infection/ contact dermatitis.

Atherosclerosis is a condition described by hardening of the arteries, affecting the heart. This is a chronic condition, caused by environmental factors (diet).

Caisson disease is an acute neurological condition that only occurs in deep sea divers, caused by a gas embolism that blocks a vessel and transportation of oxygen.

5 0

3 years ago