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lapo4ka [179]
2 years ago
7

What must have been present for life to begin the process of evolution by Natural Selection?

Biology
1 answer:
TEA [102]2 years ago
5 0

A population of organisms must exist. There must be variation among the members of the population. There must be a mechanism by which some members of the population can produce more offspring than other members. There must be a mechanism by which the variation among members of the population is passed on to their offspring.

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3 years ago
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masya89 [10]
The answer to this question is A
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4. Which of the following elements does not want to have eight valence electrons? a. magnesium c. hydrogen b. oxygen d. nitrogen
Cloud [144]

Answer:

Hydrogen.

Explanation:

Hydrogen is the simplest chemical element that exists. The symbol for the chemical element Hydrogen is "H" and it is a colourless, tasteless, odorless, and highly flammable gas.

Hydrogen is a chemical element found in group (1) of the periodic table and as such it has one (1) electrons in its outermost shell. Therefore, Hydrogen has an atomic number of one (1) and a single valence electrons because it has only one proton and one electron in its nucleus.

Based on the octet rule which states that atoms of chemical elements gain, lose or share electrons so as to have eight (8) electrons in their valence shell. Therefore, atoms of chemical elements bond in order to attain the electronic configuration of a noble gas i.e a full valence shell which comprises of eight (8) electrons.

However, the chemical element "Hydrogen" is an exception to the octet rule because it is only able to hold a maximum of two (2) valence electrons in its outermost shell to become full.

<em>Hence, Hydrogen is an element which does not want to have eight valence electrons. </em>

7 0
3 years ago
Which is the most efficient way to avoid DNA mutations from UV radiation
dmitriy555 [2]
Avoiding contact with UV radiation
3 0
3 years ago
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On the ph scale which value is considered neutral <br> A-7<br> B-5<br> C-11<br> D-2
MAVERICK [17]

Answer: On a ph scale its measures how acidic or basic the substance is and it ranges from 0-14 the smaller numbers are acidic and the bigger numbers are basic. The neutral number which is between 0-14 is 7 and a example of a substance that is neutral is distilled water.

Explanation:

3 0
3 years ago
Read 2 more answers
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