Which of the following is true about natural selection?
a.
natural selection is the only cause of changes in a species.
b.
natural selection usually causes a species to change suddenly.
c.
natural selection usually causes a species to change gradually.

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❖ The correct answer choice is C. Natural selection usually causes a species to change gradually.

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explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.