Answer: experimentation and then conversion of experiments into theories
Observations lead to form hypothesis and then deduction which are proved statistically by experiments
The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
Answer:
the number of protons in an atom
The answer is d., nervous tissue that promotes movement in the muscle tissue, triggers the brain on what muscle tissue needs to move, as in walking or lifting weights...
