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

the overall balanced equation

6co2 + 6h2o > c6h12o6 + 6o2

sunlight energy

where: co2 = carbon dioxide

h2o = water

light energy is required

c6h12o6 = glucose

o2 = oxygen

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.