Answer: He supported polygeny through his work measuring human skull volumes. He measured modern and ancient skulls and concluded that the human race (or species) could be ranked on a scale of intelligence. He concluded that the ancient Egyptians were not African, but were Caucasian.
Answer:
False
Explanation:
One of the proof of a good scientific experiment is the ability to reproduce the steps leading to the results obtained from the experiment.
To proof the validity of the claims of an experiment by other scientists:
- Every experiment must be reproduceable by other scientists.
- This will enable the experiment to be rid of any bias.
- For the conclusions of an experiment to be validated by other scientists, such experiment should be tested by others.
- If the results are the same, then the hypothesis can be advanced.
- If not, the experiment is redesigned or discarded.
Answer: a. action potential frequency is high enough that no relaxation of muscle fibers occurs.
Explanation:
A tetanic contraction occurs due to repeated stimuli at short intervals. In this situation, the muscle fiber does nor relax and contracts again. It is a process of sustained contraction of muscles, which evoke when the motor nerve innervates a skeletal muscle and emits the action potential at high rate. The muscles become hyperactive in this condition.
<u><em>-Why does the lysosome have a different pH than the cytoplasm? </em></u>
The pH within lyosomes is more acidic than the pH of the cytoplasm because Enzymes within the lysosomes aid the breakdown of proteins, polysaccharides, lipids, nucleic acids, etc. These enzymes are active at a much lower pH than that of the cytoplasm. Thus the different pH from the cytoplasm.
<u><em>-What is the advantage of having several smaller chloroplasts and not just 1 huge one?</em></u>
The advantage of having several smaller chloroplasts and not just 1 huge one increases the surface area for the light to be absorbed. As a result, more light energy can be utilized.
