Answer:
D
Explanation:
Sickle cell disease is not contagious, so you can't catch it from someone else or pass it to another person like a cold or an infection. People with sickle cell disease have it because they inherited two sickle cell genes , one from each parent.
D is the answer to 3 | C is the answer to 4
Answer:
A
Explanation:
I dont really know i just guessed i dont get this type of stuff
The answer is plants. Plants are at the start of the food chain :)
It has two phosppholipid layers that are either hydrophobic and hydrophillic the function is to protect thing from coming in and out
