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Crazy boy [7]
2 years ago
15

Approximately 3.85 billion years ago, a group of single-celled microorganisms known as __________ were alive, reproducing, and e

volving.
Biology
1 answer:
seraphim [82]2 years ago
7 0

Microbes.  — cells that have a nucleus, like an amoeba or a paramecium

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The spikes on pollen grains probably
Viefleur [7K]

Answer:

<h3>a) allow pollen grain to stick to insect</h3>
6 0
3 years ago
How a change in glycoproteins affects a cell’s ability to maintain homeostasis
Licemer1 [7]

Explanation:

Most of the cell surface receptors and glycoproteins. These glycoproteins have active sites that recognize specific signals, like hormones, that initiate secondary signaling pathways inside of the cell, in response to the external signal. This is how cells respond to environmental stimuli.

If a change in glycoproteins makes them unable to bind signaling molecules (like hormones) or makes them permanently bind these molecules, there will definitely be a defect in how the cell responds to external stimuli.  The cell will be, for example, be unable to respond to insulin in case of elevated blood sugar levels as is the case with diabetics.

Learn More:

For more on glycoproteins check out;

brainly.com/question/11473349

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8 0
3 years ago
Which of these is a way the immune system works with other body systems?
zhenek [66]

Answer:

A. The spleen filters pathogens from blood

Explanation:

-The spleen is sometimes called the “filter of the blood”

-It works closely with the circulatory system for transportation needs and the lymphatic system for production of lymphocytes.

6 0
2 years ago
A hybrid flower would have a genotype of ___<br> 1. TT<br> 2. tt <br> 3. Tt
kkurt [141]
3 would be the answer
5 0
3 years ago
Read 2 more answers
Please help! 25 points:)
ladessa [460]

Answer:

D. IV -> III -> II -> I

Explanation:

Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.

6 0
3 years ago
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