Scientist study index fossils so they will get an understanding of what life was like back then.
Answer:
"U"-shaped, with peaks at the low and high extremes of beak size; disruptive selection
Answer:
Genetics take a long time to mutate.
Explanation:
The correct answer is False. The correct word is Epidemic and not resistance.
An abrupt decrease in a host immunity of a pathogen or newly emerging novel pathogen that is found in the endemic equilibrium with the exceeded transmission threshold is where an epidemic occurs.
The answer is C) 9:3:3:1
This looks like a dihybrid cross where the expected phenotypic ratio is 9:3:3:1. However, in nature, the numbers cannot be absolut. Let's check it out:
242 purple wrinkled
84 purple smooth
70 yellow wrinkled
24 yellow smooth
Divide all by the smallest number:
242 purple wrinkled / 24
84 purple smooth / 24
70 yellow wrinkled / 24
24 yellow smooth / 24
We have
10.1 purple wrinkled which is near to 9
3.5 purple smooth which is near to 3
2.9 yellow wrinkled which is near to 3
1 yellow smooth