What is the name of a Phanerozoic era that means ancient life?

What will be an ideal response?


Paleozoic

Environmental & Atmospheric Sciences

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Springs may develop when:

a) An unconfined aquifer is drilled b) A confined aquifer is drilled c) The main water table intersects the land surface d) where a river flows across an area where the water table is beneath the surface e) where a lake is directly underlain by an impermeable layer

Environmental & Atmospheric Sciences

Atmospheric Pollutants

What will be an ideal response?

Environmental & Atmospheric Sciences

Minerals that do not contain silicon are classified as

A. silicates. B. clays. C. mafic. D. nonsilicates.

Environmental & Atmospheric Sciences

Which of the following correctly describes the composition of NAD+?

A) adenine, nicotinamide, a ribose and a ribitol linked by a diphosphate B) adenine, nicotinamide, and two ribose molecules linked by a diphosphate C) adenine, nicotinamide, and two ribose molecules linked by a triphosphate D) adenine, nicotinamide, and two ribitol molecules linked by a diphosphate

Environmental & Atmospheric Sciences