Why are certain amnio acids called a essential amnio acid?

a. because they are available in abundance
b. because they are not manufactured by the body
c. because they can form bonds with any molecule
d. because they are the most stable amongst all the amino acids
e. because they are needed for the formation of all the biomolecules

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Brainliest ! is slowing down a car an example of acceleration? explain. - explain correctly