Where's a reflecting telescope uses to gather light a refracting telescope uses
a. a lens; a curved mirror
b. a curved mirror; a lens
c. prime focus; focal length
d. focal length; prime focus

Competition occurs between species when

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?