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Mama L [17]
3 years ago
14

A population of mollusks has lived in a relatively stable environment and shown no great change in many, many years. They live,

die, and get fossilized every few hundred thousand years. Judging from the fossilized snails, little observable evolution has occurred. This is an example of
Biology
2 answers:
Katarina [22]3 years ago
8 0

Answer:

A) Stasis

Explanation:

g100num [7]3 years ago
7 0
Answer choice A. Stasis.
Stasis is a block of little to no change in a species.
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How did the temperature relate to the “recommended temperature limit” (solid horizontal red line)?
slamgirl [31]

Answer:

The “recommended temperature limit” indicates limit of the temperature that is good for our world and above this limit causes adverse affect.

Explanation:

The temperature related to the “recommended temperature limit” means that in the graph there is a limit of temperature for our world's environment. if the temperature is between this limit, there is less or no adverse effect on our environment while on the hand, if the temperature exceeds from this limit, then it adversely affected our world because the concentration of carbondioxide gas in the atmosphere increases due to this increase temperature..

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Define the 3 signals for activation and the 3 outcomes of the complement system.\
sp2606 [1]
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<span>There are indeed three ways to activate the complement:</span>
Classical pathway: Activated by Immunoglobulins in immune complexes, aggregated Immunoglobulins, DNA, CRP, apoptotic bodies .......it involves nine fractions, starting with C1, then C4, C2, C3, to form a classical C5 convertase, then, activation of C5, C6, C7, C8, C9.

Alternative pathway: activated by polysaccharides (bacterial endotoxin), vascular wall poor in sialic acid, aggregated IgE ...C3b like is the first component in the alternate channel cascade, it will create an amplification loop, and form an alternative C5 convertase.

Lecithin pathway: Activated by mannose, fucose (carbohydrate of microorganisms)The first component is the complex MBL / MASP1 / MASP2: "mannose-binding protein": works according to the same principle as the complex C1 of the classical way (MASP2 cleaves the C4 and the rest of the cascade is equivalent to that of the classical way).

the three ways have the same outcome: A C5 convertase (formed by one of the pathways) cleaves C5 into C5a and C5b: C5b is deposited far from other fractions on the antigenic surface. The fixation of C5b in the cell is followed by that of C6, C7, C8, and C9 (9 molecules of C9): formation of the membrane attack complex (MAC) ==> Death of the cell by osmotic shock
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3 years ago
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ruslelena [56]

Answer: the canine parvovirus infection is digestive

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Explanation:

3 0
2 years ago
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