Only 20 plant species, such as rice, corn, and barely, make up the main sources of food for the entire human population. what best describes the reason for maintaining the biodiversity of these plants species?

A.)to prevent famines
B.)to prevent pollution
C.)to preserve the beauty of nature
D.)to enhance the survival
please let ne know.​

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.