D. Because experimentation includes a control group. also, independent and dependent variables are part of an experiment they arent a type of research
Answer:
C. But see the answer under C. Apparently C is the accepted answer.
Explanation:
A. Not A.I don't think that's a problem for gulls especially on beaches.
B. Not B. Their feather do not look like they need much help in keeping their feathers attached when in flight.
C. This is not really the answer, but it is the best answer of these 4. The actual answer is that the bones are porous for better air intake which provides more oxygen and hence they are better able to fly.
D. Not D. Food has nothing to do with the problem. Birds get an adequate amount of food without their wings being porous. See the answer for C.
Aggergate is usually found in:
Floodplains
Alluvial fans
Mines
Answer:
Element
Explanation:
Is a substance that can't be broken down into other substances.
The development of a new species is called speciation
hope this helped