A group of field biologists goes out to mark beetles living in an area around a local pond in order to estimate the population size of the beatles. The biologists 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?

What best explains the inability for life to exist in earth early atmosphere

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

Agroup of plant cells was exposed to radiation, which damaged the chloroplasts and caused them to lose function. if the mitochondria were unharmed, what would happen to the overall function of the plant cells? a. the cells would not be able to make food, but would be able to release energy from biomolecules. b. the cells would not be able to replicate dna, but would be able to break down waste. c. the cells would not be able to break down waste, but would be able to replicate dna. d. the cells would not be able to release energy from biomolecules, but would be able to make food.