Answer:
The answer is below!!
Explanation:
Scientists believe that eukaryotes evolved from prokaryotes around 2.7 billion years ago. The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. The nucleus is where eukaryotes store their genetic information.
Hope I helped!!
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Answer:
Reduced calcium in bones.
Explanation:
When you stand, you don't lose calcium because it is a naturally occurring chemical in your body. To increase calcium levels, drink milk.
Answer:
Covering mouth while sneezing
Explanation:
It prevents germs going airborne and spreading to another person or surface.
The other answers are ways to get better from an illness or are just inefficient
Cardiovascular system has to do with the heart, so anything to reduce the risk of that system (including the heart, bloodstream etc.) would be the answer for you. So just using Process of elimination:
A) Has to do with external exposure. <em>No</em><em />
B) Keeping hands clean <em>No</em><em />
C) Avoiding cigarette smoke <em>Yes</em>
D) Keeping your vaccinations up to date <em>No</em><em />
So your answer is C.
