Answer:
d.transporta..hope that helps
Essential amino acids are amino acids that cannot be made by the body, and therefore must be obtained through eating cetain foods. (C)
Answer:
Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection)
System that removes solid and liquid wastes is called excretory system.
Hope this helps~
