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padilas [110]
3 years ago
12

Before fossil fuel use became widespread, which of the following did people use for a. energy?

Biology
2 answers:
Alex777 [14]3 years ago
3 0

Answer: im not 100% but i think its E all

Explanation:

Ratling [72]3 years ago
3 0

Answer:

e

Explanation:

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Several biology students are counting kernels in an ear of corn. They count a total of 420 kernels: 242 purple wrinkled, 84 purp
s2008m [1.1K]
The answer is C) 9:3:3:1

This looks like a dihybrid cross where the expected phenotypic ratio is 9:3:3:1. However, in nature, the numbers cannot be absolut. Let's check it out:
242 purple wrinkled
84 purple smooth
70 yellow wrinkled
24 yellow smooth

Divide all by the smallest number:
242 purple wrinkled / 24
84 purple smooth / 24
70 yellow wrinkled / 24
24 yellow smooth / 24

We have 
10.1 purple wrinkled which is near to 9
3.5 purple smooth which is near to 3
2.9 yellow wrinkled which is near to 3
1 yellow smooth
6 0
3 years ago
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Tasya [4]

Answer:

DNA changes occur primarily because of natural errors that occur during the DNA replication process. They also can happen when one or more environmental factors act on the DNA. Jul 24 2019

Explanation:

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The heart is enclosed in a double-walled sac called the
Ket [755]
This is known as the pericardium
5 0
3 years ago
How might energy and matter leave the ecosystem
Lyrx [107]
You cant get rid of energy and matter in the ecosystem. Matter is recycled in the ecosystem if we get rid of that the ecosystem will die so we can't get rid of energy and matter because it helps our ecosystem.
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What are the following causes a precipitate to form​
alina1380 [7]

Hey Buddy here is ur answer :

Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids.

Hope it helps you ...

7 0
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