Select the appropriate term to complete the sentences below.
a is a natural material used by humans that cannot be replaced.
a is a natural material used by humans that can be replaced.

renewable resource or nonrenewable resource

Aboy with an extra x chromosome probably has which of the following syndromes?

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

How do light years astronomers to determine the ages of distant objects in space ?