Put "Genetic Variation" in a sentence

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

What are some possible short and long term medical concerns for crew members on longer space exploration trips