Sci 8 Learning Check Act 8-14 Evolution and Extinction

A population of organisms is considered a new species when: it no longer interbreeds with other populations.

• it no longer interbreeds with other populations.

• it grows to a larger size than other populations.

• it is stronger than other populations.

• it is more fit than other populations.

This question refers to the following evolutionary tree. Each letter represents a species. Species R is most closely related to: species S

• species Q

• species S

• species T

• species U

This question refers to the following evolutionary tree. Each letter represents a species. Which species evolved longest ago? Look carefully at the tree as it looks different than the one we discussed in class (it's reversed...think about the one with fish on one end and birds on the other)...xoxo species U

• species R

• species S

• species U

• It is impossible to tell from this diagram.

Which statement is TRUE about the number of insect and mammal species? There are more species of insects than mammals.

• There are more species of insects than mammals.

• There are more species of mammals than insects.

• There are equal numbers of insect and mammal species.

• There is NO evidence to compare the number of insect and mammal species.

Which of the following statements is FALSE?

• Millions of species of organisms live on earth

• Organisms have evolved only over the last few hundred years.

• Many species that have lived on earth no longer exist

• Species that are endangered have a high risk of becoming extinct.

Which of the following lists organisms from YOUNGEST to OLDEST?

• mammals, bacteria, fish

• bacteria, fish, mammals

• fish, bacteria, mammals

• mammals, fish, bacteria

Which of the following organisms have existed on earth for the longest period of time?

• single-celled organisms

• multicellular organisms

• dinosaurs

• mammals

According to evidence from paleontologists and geologists, the earth is approximately:

• billions of years old.

• millions of years old

• thousands of years old.

• hundreds of years old.

Which of the following is NOT likely to be a fossil?

• a footprint

• leg muscle

• a piece of bone

• a tooth

The diagram below shows:

• a series of rock layers

• the presence of fossils

• both a and b

• none of the answers are correct