Why is variation essential for evolution

~~16. while watching a special on animals, brianna discovers that hares tend to lose heat through their ears. based on this and what is known about surface-to-volume ratios, propose an explanation as to why hares that live in hot climates (such as the desert) have large, extended ears

The same agricultural practices are used in every country of the world. select the best answer from the choices provided t f

What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?