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omeli [17]
3 years ago
5

Electrical impulses that trigger contraction of cardiac muscle cells in vertebrates originate in the _____.

Biology
1 answer:
Ne4ueva [31]3 years ago
7 0
Pns, nervous system
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Plz help will be marked BRAINLIEST
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Answer:

Cranial capacity increased the most from 2 million years ago to the present.

Explanation:

The rate of change is greatest between 2 million years ago and the present.

4 0
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The electromagnetic spectrum is made up of A:sound waves and light waves B:only light waves that you can see C:light waves you c
ikadub [295]
Sound & light waves. 

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What are the frequencies of each offspring genotype in a cross between rr female and a rr male? see section 14.2 (page 293) . vi
Dmitriy789 [7]

Answer:all homozygous dominant

Explanation: traits are known to be controlled by genes in the chromosomes.from mendels work a test cross between a homozygous rr male and a female would produce r gametes each,which when crossed produces a rr ofspring,which is homozygous for the trait

7 0
4 years ago
In the Ugandan Kob antelope, males aggregate during mating season in certain areas where they form small territories next to eac
Mariulka [41]

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Lek polygyny is a system where male aggregate at a location and try to attract females for mating and the females leave after mating. It is believed that males attract more mate in this way than in isolation.

8 0
3 years ago
How many different types of gametes can be formed by individuals of the following genotypes? What are they in each case a) AaBb
lesantik [10]

Answer: your answer will be three hundred and 15

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