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geniusboy [140]
3 years ago
12

What is the era of the multicellular algae

Biology
1 answer:
viva [34]3 years ago
3 0

Answer:

its the phanerozoic era

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HELP ME ASAP
Umnica [9.8K]
1. B Stomach
2. C Small intestine
3. A Chyme
4. D None of the Above
5. C Both A and B
6. D Blood
5 0
3 years ago
How would Earth be different without the greenhouse effect?
koban [17]
Without the greenhouse effect, there would be more ice on Earth’s surface. The answer is B.
8 0
3 years ago
Read 2 more answers
If you wanted to design an artificial hormone who's action on a target cell required the least amount of interaction with that c
vitfil [10]

Answer:

The water soluble hormones affect the target cells with least amount of interaction.

Explanation:

Hormones are the chemical messengers. These are the substances secreted by the endocrine glands. The hormones are secreted directly into the bloodstream and are carried to the target cells within the blood only.  

Based on their structure, hormones are water-soluble or lipid-soluble. The lipid-soluble hormones are steroid hormones and thyroid hormones. These hormones can easily pass through the lipid bilayer of the cell membrane of the target cell. Therefore, the lipid-soluble hormones have intracellular receptors that are present in either cytoplasm or the nucleus of the target cells.  

On the other hand, the water-soluble hormones can not pass through the lipid bilayer of the target cells. Therefore, these hormones have extracellular receptors on the surface of the target cells. Binding of the water-soluble hormones to their cell surface receptors triggers the production of the intracellular second messengers that finally carry the signal to the target protein or any other target molecule.

<u>Therefore, a water-soluble hormone exhibits the least amount of interaction with the target cell. Amine hormones such as epinephrine and melatonin, peptide hormones such as oxytocin are some examples of the water-soluble hormones.  </u>

8 0
2 years ago
13)
Julli [10]

Multiply 5730 years by 2 since two half-lives have gone by for carbon.

<u>Explanation</u>:

The half-life of a radioactive isotope depicts the measure of time that it takes half of the isotope in an example decay. On account of radiocarbon dating, the half-existence of carbon 14 is 5,730 years  

The half-life of carbon-14 is 5730 years.  

In this manner, after  

1 half-life there is 50 % = 1/2 of the first amount left.  

2 half-lives there is 25 % = 1/4 of the first amount left.  

25% is two half-lives.  

Every 50% of life requires 5730 years.  

So two half-lives require 2 × 5730

6 0
3 years ago
In some animals, black fur (B) is dominant over white fur (b). What color fur
Mumz [18]
The animal would have black fur, because the black fur is dominant over the white fur.
3 0
3 years ago
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