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gtnhenbr [62]
3 years ago
9

What is a source of adult stem cells

Biology
2 answers:
Elena L [17]3 years ago
6 0
Scientists are discovering that many tissues and organs contain a small number of adult stem cells<span> that help maintain them. </span>Adult stem cells<span> have been found in the brain, </span>bone marrow<span>, blood vessels, skeletal muscle, skin, teeth, heart, gut, liver, and other (although not all) organs and tissues. They are thought to live in a specific area of each tissue, where they may remain dormant for years, dividing and creating new cells only when they are activated by tissue injury, disease or anything else that makes the body need more cells.</span>
Vsevolod [243]3 years ago
5 0
Testes,,,,,,,,,,,,,,,,,,,,,,,................
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Leaflets are a characteristic of ________ leaves.
SashulF [63]

Answer:

compound

Explanation:

Sheets can be grouped into two basic groups: single sheets and composite sheets. The simple leaves are those in which the limb is not divided. The composite leaves, in turn, have the limbus divided into small portions called leaflets. Each leaflet may also have a small petiole, which in this case is called a petiole.

Composite leaves can be further classified into two types: pinnacles and spankings. Pinnacles are those in which leaflets start from the rake (petiole extension) as a feather. The spanking, in turn, has its leaflets starting at the very end of the petiole.

8 0
3 years ago
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Scientists are uncertain about how life began on Earth.<br>Why?​
Ksju [112]
By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
6 0
3 years ago
Which type of skin glands are most affected by the hormonal changes that occur during puberty?
Anna [14]

Apocrine sweat glands  are most affected by the hormonal changes that occur during puberty.

What is puberty ?

Between childhood and adulthood, puberty is a time of rapid growth, the emergence of secondary sexual traits, the attainment of fertility, and significant psychological changes. Although the order in which pubertal changes occur is fairly predictable, their exact time varies greatly.

At puberty, sex hormones stimulate the apocrine sweat glands, which then begin to work. In the groin and axilla, they are linked to hair follicles. The thick, protein-rich substance has no smell at first but may acquire one after coming into contact with germs.

To learn more about  pubertal changes click on the link below:

brainly.com/question/15328076

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8 0
1 year ago
Islands like St. George Island and Dog Island are common along all coastlines in Florida (Merritt Island is another example). Id
Elina [12.6K]

Answer:

These islands are barrier islands.

Explanation:

Barrier islands are islands in front of the mainland that separate part of the sea from the open sea. They lie parallel to the coast and have an elongated, narrow shape. On the sea side, dunes often shape the surface, on the land side they are flat. They were created by deposits of waves, currents and wind. Their formation requires a shallow coastal fore, a sufficiently large sediment store and a weak to moderate tidal range.

7 0
3 years ago
Which is an example of ecosystem diversity?
mrs_skeptik [129]

Answer:

D.

Explanation:

D. the Sonoran Desert and a temperate rain forest

5 0
3 years ago
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