Human skin becomes dry during winter, making it more prone to infections than during summer. how do the sebaceous glands protect the skin normally? a. sebaceous glands produce a substance that moisturizes and protects the skin. b. sebaceous glands cause the hair to stand erect, which insulates and protects the skin. c. sebaceous glands produce keratin, which gives the skin a tough structure and protection. d. sebaceous glands contain collagen fibers, which provide strength and protection.

Solar energy causes water to evaporate into the atmosphere. how does that water vapor become a cloud? a) as the water vapor goes higher in the sky, the air gets cooler. the cooler air causes the water vapor to condense. b) as the water vapor goes higher in the sky, solar energy causes it to condense around particles of dust. c) as the water vapor goes higher in the sky, the air gets warmer and the water vapor begins to condense. d) as the water vapor goes high into the atmosphere it turns to ice and that's what forms clouds.