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3 years ago

In what ways has the atmosphere helped make Earth's environment more stable?

1 answer:

5 0

The atmosphere also protects living things on Earth from the sun's harmful ultraviolet radiation. A thin layer of gas called ozone high up in the atmosphere filters out these dangerous rays. The atmosphere also helps to sustain life of Earth.

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What type of rock is formed due to the cooling and solidification of magma?

Ivahew [28]

Answer:

igneous rocks

Explanation:

6 0

3 years ago

What prevents blood movement from left ventricle to left atrium

irina1246 [14]

The Mitral valve which is also known as left atrioventricular prevents blood movement from left ventricle to left atrium.

Explanation:

Human heart is four chambered.
Two of these are receiving chambers known as atria and the other two are distributing chamber known as Ventricles.
Atria are superior chambers and ventricles are inferior chambers.
The heart has four valves broadly grouped as Atrioventricular valves and Semi lunar valves.
Atrioventricular valves allows flow of blood from atria to ventricle. These are tricuspid valve and bicuspid valve.
Semi-lunar valves allow blood to pass out of the heart. These include the pulmonary and aortic valves.
The pulmonary valve allows blood to flow from right ventricle to the heart while aortic valve allows blood to flow from left ventricle to the Aorta.
The Tricuspid valve located between the right atrium and right ventricle allows blood to flow from right atrium to the right ventricle.
The Bicuspid valve ( Mitral valve) located between the left atrium and left ventricle allows the blood flow from left atria to left ventricle.
Valves maintain the unidirectional flow of blood and thus prevent its back flow.

6 0

3 years ago

Choose all the answers that apply.

arlik [135]

Answer:

Option A, B, and C are correct

Explanation:

Incomplete dominance means that the trait represented by two alleles expresses themselves equally thereby hindering dominance of any of the allele completely.

Now,

Let us assume the allele of red petals be represented by "R" and the allele of white petals be represented by "r"

The pink flowers will have genotype "Rr"

Now if two pink flowers are crossed, the following offsprings are produced

Rr X Rr

RR, Rr, Rr, rr

Let us evaluate all the options one by one

a) Ration of pink flower to red flower ( Rr:RR)

There are 2 pink (Rr) flower and 1 Red (RR) , thus the ration of pink flower to red flower is 2:1. Option A is correct

b) one out of four offspring is white in color, therefore the % of white flower is

$\frac{1}{4} * 100\\= 25\\$ %. Option B is correct

c) Two pairs RR and rr are homozygous, thus out of four offsprings two are homozygous. Therefore %of homozygous flowers will be

$\frac{2}{4} * 100\\= 50\\$ %. Option C is correct

d) There are two heterozygous offsprings i.e Rr, therefore the % of heterozygous is $\frac{2}{4} * 100\\= 50\\$ %. Option D is incorrect

e) half of the flowers are hybrid. Therefore option e is incorrect

Therefore, Option A, B, and C are correct

4 0

3 years ago

Which reflex is triggered by food in the stomach, relaxes the ileocecal valve, and allows residue into the cecum?

kari74 [83]

Gastroileal reflex is triggered by food in the stomach, relaxes the ileocecal valve, and allows residue into the cecum.

The gastroileal reflex is triggered by the presence of food in the stomach as well as gastric peristalsis.

Gastroileal reflex brings about peristalsis in the ileum as well as the opening of the ileocecal valve, which in turn facilitates the emptying of the ileal constituents into the large intestine or colon.

The gastroileal reflex is one among the three extrinsic reflexes of the gastrointestinal tract. The other two include the gastrocolic reflex as well as the enterogastric reflex.

This type of gastrointestinal reflex is moderated by the vagus nerve and gastrin.

To learn more about peristalsis here

brainly.com/question/15265456

#SPJ4

6 0

1 year ago

Which cellular environments is conducive to the formation of disulfide bonds within or between proteins?

Solnce55 [7]

Answer:

The rough ER

Explanation:

Generally the formation of native disulphide bond is essential for the folding and maturation of proteins in the secretory pathways.These bonds are formed in the rough E.R, and also in the intramembrane of the mitochondria.

Basically an oxdative parthways is required for the disulfide bond to form, while a reductive pathway is needed for the formation of isomers for non-native disulphide bonds. These oxidative pathways takes place in the rE.R

Generally the disulphide bonds is usually formed by oxidation of two cysteines bonds. it does not occur in the cytoplasm because it is always in reduced state due to the presence of disulphide reductase. The same explains why it does not occur in the Nuclei

3 0

3 years ago