Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines?
a. diffusion
b. absorption
c. refracting
d. focusing

Apart of an ecosystem that can restrict the growth of a population is referred to as

Which of the following describes the difference in stimuli required to detect a difference between the stimuli? a. just noticeableb. signal detectionc. subliminald. top down

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species