Agroup of field biologists goes out to mark beetles living in an area around a local pond in order to estimate population size. they capture 500 beetles on the first day. they return the following day and catch a total of 400 individuals, 200 of which are marked. what is the estimated population size for the beetles?

1000

Explanation:

N = (M*C) / R

N = estimated Number of individuals in the population

M = number of individuals captured and Marked

C = total number Captured the second time (with and without a mark)

R= number of individuals Recaptured (those with a mark)

N = (500×400)/200

N = 1000

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

helicase, i think thats it