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Ivenika [448]
3 years ago
14

Approximately how many known neurotransmitters are there

Biology
1 answer:
Mila [183]3 years ago
7 0
30-100 different molecule types
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mezya [45]
Different = Heterozygous ex. Aa
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3 years ago
Question 8
sashaice [31]

Answer:

(B) They Bind to receptor proteins on the surface of the postsynaptic neuron.

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all living organisms have DNA. That DNA is made of the same building blocks(nucleotides). what does this evidence suggest?​
melisa1 [442]
It suggest that any living abject has DNA. Even if the organ is not living it still consist of DNA because it doesn’t disappear after it dies
5 0
3 years ago
A white blood cell engulfing a bacterium is an example of _____.
bagirrra123 [75]

Answer: Phagocytosis

Explanation:

Phagocytosis is the ingestion of cells or particles as a defence mechanism when white blood cells (macrophages) engulf foreign matter such as bacteria and viruses or as part of a digestion process in free-living cells such as amoeba.

3 0
3 years ago
Populations of some species of fish, insects, and crustaceans consist of both sexually and obligately asexually reproducing indi
jenyasd209 [6]

Answer:

Entirely asexual populations of animals are rare.

The cost of sexual reproduction is considered to be twice that of asexual reproduction, because sexual females produce ≈ 50% male offspring, and males typically contribute only their genes to reproduction (Maynard Smith, 1978). Following this logic, asexual reproduction should dominate unless there is greater than a two-fold advantage to sexual reproduction.

B) Factors that might maintain a given mode of reproduction might include access or availability of mates, disease, or parasites. For example, if diseases and parasites have a major effect on the population, the Red Queen hypothesis suggests that sexual reproduction would be favored

C) Sexual selection is thought to be one way by which sexual reproduction is maintained, because only fit males are able to mate. In an environment free from enemies, asexual reproduction would be favored, but are unlikely to persist over evolutionary time, because when the environment changes they will have much less ability to adapt (owing to a lack of novel genetic variation that would be provided by segregation and recombination in a sexual population).

4 0
3 years ago
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