Which of the following statements represent communication similarities between the nervous and endocrine systems? a. the nervous and endocrine systems both the body to stay in balance through homeostasis. b. the nervous and endocrine systems both communicate by sending electrical and chemical messages. c. the nervous and endocrine systems both have chemical messengers called neurotransmitters. d. the nervous and endocrine systems both provoke rapid communication between cells.

Water pollution cannot only affect the earth's water supply but it can also affect the soil true or false

[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.

Which of the following are examples of coordinate headings