Geological Time, Adaptations, DNA

polar bears have evolved to have white fur that helps them hide from their prey in the arctic where they live. what is this an example of?

• adaptation

• inbreeding

• mimicry

• genetic engineering

The pelvic bone of whales is not needed for movement within the water. This is an example of a(n) ______________ structure.

• vestigial

• analogous

• homologous

Which of the following is the mascot for the Precambrian era?

• Reptiles

• Mammals

• Cells

• Dogs

Which of the following make up a nucleotide?

• 1 Sugar

• 1 Phosphate

• 1 Nitrogen Base

• All of the above

Inherited characteristics that help an organism to survive is referred to as ____________.

• natural selection

• adaptation

• speciation

The earth is approximately how old?

• 2015 years old

• 3.5 bdillion years ol

• 4.5 billion years old

• 4.8 million years old

the gradual change in an organism over time is called

• mutation

• evolution

• variation

• migration

most of what scientists know about extinct species is based on

• sedimentary rock

• natural selection

• the fossil record

• variation

What era were dinosaurs (reptiles) alive in?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Which era are we currently in?

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era