PLEASE HELP!! A type of biome composed of a community of organisms that live and interact. Freshwater carries nutrient rich sediments that build up and form barrier islands or bars of mud and sand. What type of biome does this describe?

a) Estuary
b) Taiga
c) Temperate grassland
d) Tropical rainforest

How does the fossil record provide evidence that the modern whale evolved from the anthracotheres? a) the modern whale looks like their ancestor the anthracotheres. b) the modern whale has all of the same structures as their ancestor. c) there is not enough evidence to suggest the the modern whale evolved from the anthracotheres. d) the anthracotheres has a structure that is still present in the modern whale, but is no longer of use to the modern whale.