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viktelen [127]
3 years ago
14

Which type of cells are believed to have evolved first?

Biology
1 answer:
Dimas [21]3 years ago
5 0
The answer is prokaryotic cells evolved first. Brainliest?
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______ are chemical messengers secreted by glands. Exocrine glands, such as sweat glands, secrete fluids through ducts. _______
rusak2 [61]

Answers:

Hormones are chemical messengers....

Endocrine glands secrete hormones...

The pituitary gland plays...

is produced by the adrenal glands...

the gland will produce fewer amounts of the hormone...

produce chemicals called paracrine factors...

blood is called the thyroid.

Steroid hormones are synthesized from cholesterol, while nonsteroid hormones are synthesized from modified amino acids and small peptides. Non-steroid hormones are not lipid-soluble and therefore they need to bind to a receptor on a cell membrane; while steroid hormones can diffuse through the cell membrane.

Explanation:

Hormones are signaling molecules synthesized by glands. The endocrine glands include the adrenal glands, pineal gland, thyroid gland, parathyroid gland, pituitary gland, ovaries, testes, pancreas and hypothalamus. The pituitary gland is an endocrine gland that secretes hormones capable of stimulating the adrenal glands in order to produce steroid hormones. Hormone levels are often modulated by negative feedback, by which high-hormone levels reduce their own production. Paracrine factors (also known as growth and differentiation factors) are proteins that can diffuse across small distances in order to induce responses in neighboring cells. The thyroid gland secretes hormones involved in regulating metabolism and growth. Moreover, the thyroid gland also secretes calcitonin that regulates calcium levels in the blood.

8 0
3 years ago
Help me with this one pls
antoniya [11.8K]

Answer:

i think its the first one sorry if its wrong

Explanation:

3 0
3 years ago
Johannes Kepler was a German astronomer who lived in the 17th century. He was the first scientist to accurately describe the
iren2701 [21]

Answer:

I would say it is D.

Explanation:

It makes more logic sense.

5 0
4 years ago
benedict's solution contains copper(2) sulphate (blue). the copper (2) salt can be reduced to a red precipitate of copper (1) ox
Anna35 [415]

Answer:

I don't know

Explanation:

But I know

7 0
3 years ago
Hemophilia is a sex-linked recessive trait in humans. If a father and a son are both hemophiliacs, but the mother is normal, her
saul85 [17]

Answer: XHXh (Note: the H's are superscripts.)

Explanation:

Hemophilia is a sex-linked recessive trait which means that the males having one altered copy of the gene is enough to cause the medical condition( as they have only one X chromosomes and females have two)

In this case the genotype of father and son is such that they are affected by hemophilia.The son has mother's X chromosome and father's Y chromosome.

XhY is the genotype of father and son. As mother would be heterozygous because she is not affected, her genotype will be XHXh.

7 0
3 years ago
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