D) because those birds are scavengers and therefore there will be competition in finding food and then to fight off the other birds so that you can get the food first.
Answer:
D.) Helpful variations allow individuals to survive and reproduce better than members who lack these variations.
Explanation:
Variation is one of among the principles of natural selection.
Variations occur naturally thereby favouring some individual groups over the other.
In the above example, the helpful variations naturally select the parents of the offsprings while the other members of the group are disadvantaged.
There is only about 3 percent of freshwater on earth
B.Sunrise
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The cells in a developing embryo
