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d1i1m1o1n [39]
3 years ago
13

Why do mountaineers become breathless as they reach high altitudes

Biology
2 answers:
Alona [7]3 years ago
7 0
There aren't enough oxygen molecules in the air are higher altitudes
nexus9112 [7]3 years ago
7 0

because as you rise the pressure increases and the air gets compressed making the oxygen to decrease and go down

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Most poisonous alkaloid is extracted from tobacco leaf and widely used as an insecticide​
kakasveta [241]

Answer:

Nicotine

Explanation:

Tobacco smoke contains numerous toxic chemicals including organic carcinogens such as polycyclic aromatic hydrocarbons and aromatic amines, inorganic carcinogens such as polonium 210, and arsenic and toxic alkaloids such as nicotine. Nicotine extracted from tobacco has also been used as an insecticide.

PLEASE MARK IT AS BRAINLIEST

7 0
3 years ago
Substances known as _________ provoke a specific immune response so discriminating that only a single molecular fragment, called
MariettaO [177]

Answer:

Antigens, and epitopes.

Explanation:

Antigen is known as a substances which is capable of the causes an immune response in the body, and specifically activating white blood cells which are known as body's infection fighting cells. In general antigens are two types:

1) Foreign antigens or heteroantigens.

2) Auto-antigens or self antigens.

Epitopes are the part of an antigen which is recognized with the help of immune system, specifically by B cells, T cells, and antibodies. They are also called as antigenic determinants. The epitope is defined as the specific part of the antigen where an antibody binds.

5 0
3 years ago
Read 2 more answers
What is the definition of epistasis?
ollegr [7]

The definition of Epistasis in gene biology is Choice D: when the allele of one gene masks the phenotype of another gene

Definition:

When the phenotypic effect of alleles at one gene are masked by alleles of another gene.

In essence, a gene is said to be epistatic when its presence suppresses the effect of a gene at another locus.

It is important to know that Epistatic genes are often called inhibiting genes because of their effect on other genes which are described as hypostatic.

Additionally, there are six common types of epistasis gene interactions:

  • Dominant

  • Dominant inhibitory,

  • Duplicate dominant,

  • Duplicate recessive,

  • Polymeric gene interaction,

  • Recessive.

Read more:

brainly.com/question/24167831

6 0
3 years ago
See cause i dont understand this at all​
AleksandrR [38]
I believe it’s the points where they are at its highest soo 38 and 7.5
8 0
3 years ago
For two populations to evolve into two species that look different, what must happen?
soldier1979 [14.2K]
I think its reproductive isolation 
6 0
4 years ago
Read 2 more answers
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