The answer is C: Tt and tt.
800,000 to 1.5 million nephrons on average per kidney
Answer:
B
Explanation:
plz mark as the brainliest plz
I think the correct answer from the choices listed above is option B. Models need to be changed when <span>scientific understanding changes. This should be done since the assumptions where the models are based on are changed. Hope this answers the question.</span>
C) neurons - nerve tissue - brain - central nervous system - human being