4 Select the correct answer.
Human skin becomes dry during winter, making it more prone to infections than during summer. How do the sebaceous glands protect the skin
normally?
OA
Sebaceous glands produce a substance that moisturizes and protects the skin.
ОВ.
Sebaceous glands cause the hair to stand erect, which insulates and protects the skin.
Ос. .
Sebaceous glands produce keratin, which gives the skin a tough structure and protection
OD
Sebaceous glands contain collagen fibers, which provide strength and protection.
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Ascientist is studying muscle twitches in chicken quadriceps. to activate the muscle, he needs to provide stimulus to the

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Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?