In certain ecosystem, the number of cheetahs is lower as compared to their prey, gazelles. if the cheetahs disappeared from this ecosystem, then the number of gazelles will increase. this will disrupt the ecosystem of the forest because the gazelles will compete for limited food resources and possibly exhaust them. in this scenario, what type of species are cheetahs?

a. pioneer
b. seral
c. climax
d. keystone

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.