Can somebody help me with this? :(

I will give brainlest guyss

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

What condition is kept close to its set point in osmoregulation? a. body temperature b.platelet count c.blood glucose level d.water balance

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass