The first picture shows a cross-section of ground with four different sediment layers. The red, purple, yellow, and black colors represent four different types of sediments. Rainwater (the blue circles) has fallen on the ground and has moved through some of the layers.
The second picture shows close-up views of four types of sediments: gravel, sand, silt, and clay.
Based on the pictures, what type of sediment is represented by the black layer?

Explain your answer.

c should be the answer

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.

i think the answer is a.keratin is the pigment responsible for skin color.