How is sympatric speciation similar to allopatric speciation?

They both involve speciation due to physical barriers.

They both result in a subspecies evolving into a subpopulation.

They both are mechanisms by which new species arise.

They both involve joining two gene pools that were formerly separated.

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes