Answer:
(sorry if im incorrect)
D
an organ, a level of organization that is higher than an organelle
Explanation:
So levels of structures goes :
atom, molecule, organelle, cell, tissue, organ, organ system, organism
This is because you have to let your food digest a bit before continuing your work out to prevent cramps and this like that.
C.
asexual means only one parent while sexual reproduction needs sperm and eggs
Temperature difference and Earth's tilt
Modeling and predicting what is bound to happen in the future using deduction of impossible possibilities
