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hram777 [196]
3 years ago
7

Which event marks the beginning of the cambrian era?

Biology
1 answer:
Scilla [17]3 years ago
5 0

Answer:

D) largest mass extinction event in Earth's history

Explanation:

The cambrian era started following the pre-cambrian extinction

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Is the elliptical shape of the earths orbit changes all the time
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It is known that the Earth's orbit around the sun changes shape every 100,000 years. The orbit becomes either more round or more elliptical at these intervals. The shape of the orbit is known as its "eccentricity." A related aspect is the 41,000-year cycle in the tilt of theEarth's axis.

6 0
3 years ago
What state of mind does alcohol initially produce in most adults after the first drink?
Cerrena [4.2K]

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8 0
3 years ago
If 1000 f2 offspring are obtained, how many flies of each phenotype are expected?
aniked [119]
<span>In Drosophila + indicates wild-type allele for any gene, m is mahogany and e is ebony. Female parents are m+/m+ and males are +e/+e. F1 are m+/+e, all wild type. F1 females are crossed with me/me males - the test cross. Offspring will be : non recombinant m+/me, mahogany wild type or +e/me wild type ebony. OR recombinant me/me mahogany ebony or ++/++ wild type. As the two genes are 25 map units apart, the percentage of recombinants will be 25% and therefore percentage parental types will be 75%. 75% 1000 is 750. There are two parental types, so you would expect 375 of each. Therefore, you would expect 375 m+/me and 375 +e/me. 25% of 1000 is 250 split between two recombinants =125 of each. Therefore you would expect 135 me/me and 125 ++/++</span>
7 0
3 years ago
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Answer:

A

Explanation:

8 0
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