The term used to describe the dry mass of living or once living organisms per unit area is

A ball's mass is 1.5 kilograms, and it leaves the racket with a horizontal speed of, say 90 mph. Find the average force on the tennis ball as it is served

Which is a reservoir for nitrogen? A. lightning B. biomass C. nitrogen gas D. ammonium E. nitrogen-fixing bacteria

Which of the following statements best describes how a corn plant comes to produce the Bt toxin? A. The Bt gene is inserted into each plant cell, one at a time, by using a bacterial plasmid. B.

How do most researchers today view menopause? it is a normal part of the aging cycle. it produces severe irritability. it is responsible for increased anxiety attacks. it produces mood disorders?

An organism has 12 chromosomes in its germinal cells. During spermatogenesis, which of the following cells is the first to have 6 chromosomes? A. primary spermatoctes B. secondary spermatocytes C. spermatids

When Jacob starts running, his legs move faster and his heart rate increases. Which types of muscles are involved in these changes

Which cells are not formed during meiosis

Why did the average life expectancy fall during the Black Death? Select one: a. The plague affected mostly the elderly, especially women. b. The principle victims were infants and young adults. c. There was high infant and elderly mortality. d.

Plants produce carbon dioxide as a product of cellular respiration but you know that plants release oxygen carbon dioxide develop a logical argument for how this is possible

Rna polymerase binds to regions pf dna called blank which are start sinals for transcription