Which best characterizes the Precambrian era?

A.

abundant plants and animals

B.

dinosaurs

C.

small, one-celled organisms and primitive jellyfish

D.

extensive mountain building

Eyes with single lenses that respond to light and darkness are found in many arthropods; these are the

What Mineral Property that is described using terms such as pearly, or earthy, or silky? A) Luster B) Color C) Hardness D) Streak E) Cleavage

Is a flake of bricks a mechanical or chemical

What are volcanoes and describes the type of volcanoes

When atoms combine to form compounds, they gain, lose, or share

What is the difference between the key words "trait" & "allele"?

A cuticle occurs on the surface of organisms of many phyla and appears to be an advantageous feature. why have higher organisms not retained this structure?

After complex organic molecules have been absorbed in the small intestine, what materials are left behind?

What makes the trash in this landfill more of an environmental blight than the trash found in other trash dump areas? A) It is bigger. B) It is smellier. C) It won't disappear. D) It is harder to see.

What effects do currents have on objects in the ocean