Unit A Section 1.3

Question 1

What do healthy ecosystems have

Answer 1

Healthy ecosystems have a great deal of genetic diversity among the species that inhabit them.

Question 2

variability:

What is Variation within a species

Answer 2

it is the genetic difference within a species. it could be due to appearance. Some people have dark skin color while others have a lighter skin color.

Question 3

Why is variability important

Answer 3

When the species has a great deal of variation among its individuals, it is more likely that some of the individuals will survive environmental changes.

(Environmental changes donèt have to be related to weather, It could be a new predator or disease too)

Question 4

What are superbugs:

Answer 4

Over time, some germs
have become very
resistant to medicines.

Question 5

What is Natural selection

Answer 5

Another aspect of species survival and variability is natural selection
- occurs when the environment “selects” which
individuals will survive long enough to reproduce.
-Ex. There were 1800 cliff birds dead whereas some of them survived.
-. The Browns hypothesized that the bigger birds were selected for survival because their larger size allowed them to store more fat and their greater symmetry allowed them to forage with less energy loss.