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lys-0071 [83]
3 years ago
9

Explain where scientists think Earth's water may have come from.

Biology
2 answers:
stellarik [79]3 years ago
5 0

A study suggests much of the water originated in rocks from which Earth is built. AUDIE CORNISH, HOST: ... She says that source of water could have been farther out in the solar system, like maybe icy comets or water-rich asteroids that hit the newly formed Earth and watered it. This has long been the prevailing view

Arte-miy333 [17]3 years ago
5 0

Explanation:

Scientists have long debated whether the Earth's water was here when the planet formed or whether it arrived later. A study suggests much of the water originated in rocks from which Earth is built.

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18. If a cell needs to get waste out and nutrients in, this works best if
Dovator [93]

Answer:

We reduce the size of the cell

and increase surface area to volume ratio.

Explanation:

6 0
3 years ago
Hemoglobin carries oxygen to the body's cells. which system contains hemoglobin?
-Dominant- [34]
Hemoglobin carries oxygen to the body's cells. which system contains hemoglobin?
D. Circulatory
3 0
3 years ago
Etrodotoxin is a potent toxin found in a variety of organisms including the pufferfish. The toxin binds to the extracellular sid
Eddi Din [679]

Answer:

C

Explanation:

Tetrodotozin is a sodium channel blocker. that is; it prevents the opening of sodium channels in the  neuron needed for depolarization and action potential production.

T<u>he voltage gated sodium channels in the nerves and skeletal muscles are blocked, action potential are not generated from these areas,Therefore potassium channels are permanently open leading to hyper polarization, and since sodium channels can not open, they remain in refractory state, this leads to muscular paralysis leading to impairments of respiratory and cardiac functions.</u>

Specifically the  paralysis of the diaphragm muscles, lead to collapse of the lungs, preventing breathing,leading to suffocation and death.

This is an example of competitive inhibition;The  introduction of cholinergic acetycholine neurotransmitter  reverses the blockage of sodium channels

7 0
4 years ago
In Europe, approximately 4% of people are red-haired, mostly due to a recessive mutation in the melanocortin 1 receptor (MC1R).
Wewaii [24]

Answer:

33%.

Explanation:

The 4% population is red-hair due to the recessive mutation in melanocortin 1 receptor (MC1R).

Since, the population is in Hardy-Weinberg equillibrium- laet the frequency of recessive allele with red - hair is 'q' and the frequency of dominant allele in the population is 'p'.

q^{2} =4\%

q^{2} = 0.04

q=0.2

According to hardy-weinberg equillibrium

(p+q)=1

p=1-q

p=1-0.2

p=0.8.

The total population with non red hair is calculated by

=p^{2} +2pq

= 0.64 + 0.32

= 0.96

The percentage of the population with non red headed carrier for MC1Rr is calculated by:

=0.32/0.96*100

=33%

Thus, the correct answer is (B).

8 0
4 years ago
Alleles that are linked on the same chromosome will assort independently during meiosis.
KIM [24]
The answer is A or true
7 0
3 years ago
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