Env Syst CA3 Review

Which of these is an example of natural selection?

• The largest animal in a population will have more opportunities for reproduction.
• Several species of organisms work together so that they all succeed.
• One species takes all the resources in an environment leaving none for others.
• Organism that are best suited to an environment tend to survive and reproduce more often.

Humans have been a very successful species on earth.  They have very large, very diverse populations spread all around the world. As a result,

• Human have very limited ability to adapt to changes in the environment.
• Young humans have lower survival rates as compared to other species.
• Humans have a potential to adapt to various environmental changes.
• All humans are more disease resistant.

Which of the following explains adaptation.

• An individual organism changes to meet its needs in the environment. These changes pass down to their offspring.
• The species as a whole changes their characteristics.
• Beneficial traits allow organism to survive and pass on those traits
• New characteristics arise in a species as needed.  If these traits are helpful, they are passed down.

What might account for the fact that all of these limbs share similar structures?

• They came from the same source
• They are all from one animal
• They are very similar organisms
• Cooincidence

Define homologous structures.

• Structures that appear the same, but have different ancestral origins.
• Structures that appear the different, but have the same ancestral origins.
• Any two body parts from the same organism
• Parts that no longer appear to have a function

Which species’ DNA is most similar to the DNA of the toothed whale? 

• Hippopotamus 
• Baleen Whale
• Grazing Mammals
• Camels

What conclusions can be made based on this table shown?

• the American black bear and the giant panda are most closely related

• the giant panda and the red panda are most closely related

• the red panda and the racoon are the most closely related

• the giant panda and the racoon are most closely related

The picture shows the members of the Camelidae family. The physical features and the geographical origin of these animals provide evidence that - 

• they live in the same type of environment.
• have slowly evolved to become herbivores.
• have a common ancestor.
• exchanged DNA in the past.

Which layer is the youngest

• 1
• 2
• 3
• 4

How do fossils provide evidence that evolution has happened on Earth?

• Fossils show how the sizes of certain animals has changed drastically over millions of years
• Fossils show that some species have gone extinct
• Fossils show how life forms present today are different than those from the past
• Different sedimentary rock layers provide evidence for how the environment has changed over time