Which rock layer in figures 1 and 2 are about 500-600 million years old?

Which amino acid has a side chain that can form hydrogen bonds with a suitable partner?

Forested land in the Amazon basin is currently being cleared for agriculture, just as land in the Midwestern U. S. was cleared for agriculture in the 19th century.

Which term describes the changes that occur in an organism during its lifetime

What would happen to an embryo if all of its cells fail to go through S phase (DNA replication) ? Is the embryo likely to survive, and why?

Are coral reefs found only in certain places? What are the abiotic conditions needed for coral reefs to grow and survive? (apex)

Where in the DNA molecule does hydrogen bonding occur? A between the sugar and the phosphate group B between the phosphate groups C between the nitrogenous bases D between the sugar and the nitrogenous base

Which water-soluble vitamin plays an important role in the formation of collagen? A. vitamin C B. thiamin C. folate D. biotin

Which is a possible negative result of using renewable resources?

Explain the following statement: science is self-correcting

Inactive or stored energy is called kinetic energy. a. True b. False