Which statement correctly contrasts endocrine glands and exocrine glands?

a. endocrine glands secrete hormones directly into blood, and exocrine glands secrete hormones into ducts.
b. endocrine glands are typically found in the cutaneous membrane, and exocrine glands are found all over the body.
c. endocrine glands form tissue layers, and exocrine glands form organs.
d. endocrine glands secrete one type of hormone, and exocrine glands secrete several types of hormones.

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.

What is your thoughts on the use of medical marijuana? (social experiment) re posted i need 5 opinions there are no wrong answers.

(asap will give 20 ) what is dr. smith guilty of in case given below? dr. smith, a surgeon, recommends and performs a surgery on amy. other surgeons had already determined that amy did not need the surgery. dr.smith is guilty (on plato)