Simple 6th grade easy science! pls help i put the rest o my points into dis :>

A and D

Explanation:

D, because the defentition of quantitative means: measured by the quantity of something rather than the quality,

And A, because continuous means to continue the whole of something. In this case, you are continuing the research of the specific group of ducks.

i believe the correct answer is c

what effect does exercise have on the nervous system?

the answer is c.