The younger layers of rock in the grand canyon are on top of the older layers. which of steno’s principles best explains this?

a) principle of original horizontality
b) principle of superposition
c) principle of lateral continuity
d) principle of original verticality

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim

This group of organisms perform the process of ammonifcation. a. herbivores b. decomposers c. carnivores c. plants