Answer:
This question is to vague. What understanding?
Explanation:
Option (a) has a greater chance of being the answer — the respiratory system does take in Oxygen to break down glucose into Carbon dioxide and water vapor, releasing energy.
Option B- The iterative design process must be followed step by step.
This is true about the designing solutions in science.
The scientific design process is a series of steps that are followed while trying to solve a problem and design a solution for something. It is a methodical approach to problem solving.
Answer:
a. 200,000 years ago.
Explanation:
Scientists believe that Homo neanderthalensis appeared about 200,000 years ago. The name Homo neanderthalensis was given to them because first evidence of their existence was found in Germany near Neander Tal. Their period of existence is part of the Pleistocene period and they are considered as the immediate ancestors of modern humans (Homo Sapiens).
