B. carbon and hydrogen
C. potassium and chlorine
D. sodium and hydrogen
The answer is B. germline mutation.
The germline mutation is heritable variation in the lineage of reproductive (germ) cells. Germ cells are cells that give rise to the gametes, so a mutation in germ cell will be seen in a sperm cell or egg cell but not in a skin cell, for example.
The point mutation is the changes in a single nucleotide base on the DNA molecule.
Frameshift mutation, due to addition or deletion of a base, results in the change of reading frame and totally different translation
Somatic mutation is mutation in a somatic cells and is not passed on to the next generation.
The right answer is an isotonic solution.
An isotonic solution is a system in which the osmotic concentration is the same as the solute concentration of a cell. In this case, the cell does not swell or shrink because there is no gradient of water concentration across the cell membrane.
The water molecules diffuse across the plasma membrane in both directions, and the rate of water diffusion is the same in each direction of this cell without gaining or losing water.
ecosystem
biosphere
organism
B. Perissodactyls
C. Artiodactyls
D. Sirenians