It's called chemical reaction.
(I'm not real sure)
I think it's a hypothesis.(;
Answer:
A group of similar cells make up a tissue. Several tissues make up an organ.
Explanation:
The answer of the first question is double fertilization !!! I don't get the second question so.... comment if you have that question !!!
Answer:
Small intestine is designed to more and more area for absorption of digested food and transfer into the blood for circulation throughout the body. The inner lining of small intestine has a large number of finger-like projections called villi. These villi provide a large surface area for absorption of food.
Explanation:
Hope this helps!
Have a good day or night!