<span>Women's mean hemoglobin levels are about 12% less than the mean hemoglobin levels of men. This sex-related difference is observed in many species of animals, such as birds and reptiles. It's believed this difference exists in humans between males and females because men have larger bones, which means they would have more blood cells producing bone marrow. Additionally, men's kidneys have a larger diameter than women's kidneys, which would lead to increased red blood cell production.</span>
Answer:
It's important for a scientist to try to hold all variables constant except for the independent variable. If a control variable changes during an experiment, it may invalidate the correlation between the dependent and independent variable. When possible, control variables should be identified, measured, and recorded.
The percent of the Earth's ocean is 70%.
I’d say, Humans have the ability for rational thought
Hope it works. Good luck :)
Answer:
hydrogen and oxygen combine explosively in a single raction
Explanation:
The reason is Molecules of hydrogen react with oxygen violently to break the initial molecular bonds and form new one between the atoms of the two elements. The reaction results into an explosive release of energy and the production of water because the products of the reaction are at a lower energy level
