Nitrogen-fixing bacteria is(are) indicated by the letter(s) . The nitrogen cycle. Each letter indicates a definite member of this cycle. Letter A indicates bacteria that convert nitrates (NO3 minus) to nitrogen (N2) and release it to the atmosphere. Letter B marks bacteria that transform nitrites (NO2 minus) into nitrates (NO3 minus). Letter C marks bacteria that transform ammonium (NH4 plus) into nitrites (NO2 minus). Letter D marks bacteria that transform nitrogen (N2) of the atmosphere to ammonium (NH4 plus). Letter E marks bacteria that assimilate nitrogen (N2) of the air and are located in the root nodules.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

When mendel crossed a true-breeding short plant with a true-breeding tall plant all the offspring were tall. which term describes the gene for tallnes?