Answer: genetic variation is a mutation or a change in the sequence of DNA. It can be preserved if that sequence is needed for a species to survive ( evolution). It can also be preserved if that sequence is strong enough to be passed down from mother to child. The mutation can be eliminated if it causes distress to the animal or if it makes the animals chances of survival smaller. If an extra fin on a dolphin helped it to better escape its predator and better obtain food then this trait may stick around because it is beneficial to the species. If the fin cause the dolphin to swim slower then the dolphin may not survive to reproduce or the trait will not pass on.
Explanation:
Answer:
After the vernal equinox, the most direct rays of the sun striking the earth continue to migrate north. On June 21/22, the most direct rays of the sun fall on locations situated at 23.5 degrees north latitude.
Answer:
HALVED
Explanation:
The formula for density is density
=
mass
/volume
.
We need to double the volume. multiply it by 2
.
But in order to multiply one side of the equation by a number, the same has to be done to the other side.
Multiplying the volume by 2 is the same as multiplying the fraction mass volume by 1/
2
.
So let's multiply both sides of the equation by 1
/2
:
⇒
1
/2
×
density
=
1
/2
×
mass
/volume
⇒
density
/2
=
mass
/2
×
volume
