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.
<u>Answer</u>: The energy source that generates wind is actually the sun.
<u>Explanation</u>: The uneven heating of the Earth's surface by the sun gives rise to differences in atmospheric pressure. Areas such as deserts will warm the air masses above much more. As air is heated, it has a lower density as it expands and thus will form a point of low atmospheric pressure. The opposite situation applies for high pressure areas.The air movement from areas of high pressure to areas of lower pressure is what we call wind.
Answer:
The correct answer is option D. "whether the muscle moved the skeleton, the heart, or another type of internal organ".
Explanation:
It is possible to determine whether a sample of muscle tissue moved the skeleton, the heart, or another type of internal organ by analyzing its cellular structure and organization. For instance cardiac muscle is striated and organized into sarcomeres, while smooth muscle that is located in organs such as intestines, uterus and stomach are not organized into sarcomeres.
