Match each fossil with the layer where it’ll be present based on these conditions: dinosaurs existed before birds. corals existed between trilobites and amphibians. trilobites are the oldest fossils. dinosaurs are younger than amphibians. birds are the youngest species to be observed in this stratum. layer a is the top layer.

a - Birds

b - Dinosaurs

c - amphibians

d - corals

e - trilobites

Assuming that layer A is the top and the youngest soil layer and E is the most ancient layer, the fossils that correspond to each layer are: A- Birds; B- Dinosaurs; C- Amphibians; D- Corals; and E- Trilobites.

Explanation:

There are two groups of fossils. In body fossils, the remains of the living organism are preserved by drying, freezing, mineralizing, or petrifying. Trace fossils are footprints of the living organism. Most fossils are formed when living organisms get buried; soft tissues decompose, and hard tissues (like bones, shells or seeds) are replaced with sediments. Fossils get buried and become part of the soil. With time, different layers of soils are generated at the top. The youngest fossils are found in the top (younger) layers of soil and older fossils will be found at the bottom (older) layers of soil.

With respect of the order: because Corals existed between Trilobites and Amphibians, they have to be grouped, and because Trilobites are the oldest fossils, the order (older to younger) is Trilobites, Corals and Amphibians. Then the youngest fossils are Birds, but dinosaurs are younger than birds.

b brown mice / white sand dunes

"do a testcross with a homozygous recessive plant."