Which of the following IS an example of natural selection causing evolution? A. A volcano erupts and the cooling lava turns the white sands black, the local population of mice are now preyed upon easier if they have lighter fur leaving the dark furred mice alive to reproduce more dark furred mice.

B. A giraffe struggles and stretches to reach the leaves on the tallest branches, eventually lengthening its neck. When it reproduces, its offspring has a long neck as well.

C. A man mows his yard once a week, this keeps the normally long grass short over a greater period of time.

D. Dog breeders only allow the smallest dogs in a litter to reproduce eventually creating miniature varieties of the breed.

B

Explanation:

The definition is that orginisms adapt to their enviroment to survive and breed. This answer fits that definition

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.