Answer: All the options are correct.
Explanation:
A pericardium is the sac that compass the heart , protects , lubricate and keep it in place.
The functions of pericardium are:
1. It keep the heart fixed in its place in the chest cavity.
2. It prevent the heart from stretching and overfilling with blood I.e it minimize blood infow.
3. It prevents friction by lubricating the heart.
4. It protects the heart from infection that might be nearby either from lungs or other organs.
Answer:
Farming enabled people to grow all the food they needed in one place, with a much smaller group of people. This led to massive population growth, creating cities and trade.
Hope this helped a little <3
I am pretty sure that the thing which most likely happen to plants if they did not have a waxy outer coating is being revealed by the last option D. They would be harmed by insects and UV radiation. Every plant has to be protected by membrane so that it would be able to deal with drought small invaders and other external forces.