When a horse (Equus ferus) and a donkey (Equus asinus) mate, their offspring is an infertile mule. The mule is an example of a
a. mutation
b. hybrid
c. trait variation
d. speciation event

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

Aquaternary consumer species would be expected to have a smaller population than a secondary consumer species. select the best answer from the choices provided t f

If 360 joules of work are needed to move and create a distance of 4 m what is the weight of the crate