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lesantik [10]
3 years ago
10

How many elements in nature are there and what are they

Biology
1 answer:
bija089 [108]3 years ago
8 0

Well there's Water, Earth, Fire, and Air. Not quite sure how this would be a school question. But here it is.

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Here plz help? i’m stuck
almond37 [142]

Answer:

I'm sorry. I wanted to try and answer the question but I can't because it isn't clear.

4 0
3 years ago
A person's blood type is determined by the:_______
matrenka [14]

Answer:

) Presence of specific glycoproteins on the cell membrane

Explanation:

When specif glycoproteins(antigens)  or antibody are present on a cell membrane of Red blood cell,they can  be used to identify the blood type.Antigens are substances capable of triggering an immune response in a cells.

In addition,they function in transport of molecules across the RBC. They help in the maintenance of the RBC,and aiding the arrest of cells capable of causing diseases to the body.

Therefore,they are good determinants of blood types,based on this two types of antigens present in a  blood type.

These two antigens  used for classification of blood types are the 1-the ABO antigens 2,the Rhesus antigens.

Essentially,when a WBC produces an antibody ,which is a molecule that defends the body,If this is not compatible,the antibody will recognize it as a foreign body and attack it.Thus such blood types are not compatible. Thus the antibody-antigen reaction are good for knowing and classify blood types.

Antigen can also be glycoprotein,carbohydrate or glycolipids.

Generally blood types are inherited from both parents.Therefore the antigen present on the RBC are combination of the alleles from each parent.

4 0
2 years ago
PLEASE I NEED THE ANSWER PLEASE
Olegator [25]
…………………………………………….,.,.,,.,,,,.,,.,,.,.,.,.,,,
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Insects are the most diverse group of organisms, in terms of numbers of species, dominating terrestrial habitats.
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It’s true, there are more insects than there are any other specie and more kinds
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Which test is used to detect down syndrome by collecting blood from the umbilical cord after the 18th week of pregnancy?
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Fetal Blood Sampling.
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