What is a mutation?
a. any change that is harmful to an organism
b. any change in a gene or chromosome
c. any change that is to an organism
d. any change in the phenotype of a cell

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

its probably to later but whats the question

b . streams flow into shallow areas.

f . movement of earth’s crust creates low areas that fill with water.