what is a mineral's estimated hardness if it can scratch a fingernail, penny, steel plate, and glass?

The conditions on earth around the time of the origin of life were very different from those of today. most of the molecules present were likely produced by:

Describe the relationship between genetic testing and the polymerase chain reaction. How has the PCR technique made genetic testing possible on a large scale? For smart people only

Water can move through plants in the same manner as water can move through straws. Transpiration is the process of water movement through a plant from absorption at the root through evaporation at the leaf.

Explain how it would be possible to have a change in a single base of DNA, but have the protein NOT change and be functional.

Many species of aquatic snails secrete a slime and are adapted to live in coastal regions. Rather than swim, they move along the ocean floor in shallow water, wedging themselves into crevices or burrowing into sand.

Scientists try to predict the location of major earthquakes based on which of the following? location of fault zones location of a mountain location of an ocean location of the science lab

What Are The Branches Of Botany?

Rocks, temperature, and water ARE what part of the environment

Georges Cuvier's discovery of fossils of Irish elk and giant ground sloth:

If your body has 42 chromosomes, how many will your gamette have