Answer: D. there's no difference
Other statements didn't made sense so that's why It's D.
Hope this helps!!
Answer: To help retain warmth throughout the winter, they also grow thicker, shaggier coats, which they shed in the spring when the weather becomes warm again.
Explanation: They want to stay warm.
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:D
There is external and internal so I'll list th external. The most important is skin then mucus, sweat or secretion, hair, nails and tears which are all part of the integumentary. Some internal defenses are white blood cells and T cells.