HSLS 4-4 1.5 Set 1

identify the selection pressure that is most likely influencing the population below

In a desert with mostly sandy-colored rocks, lizards with light brown scales are harder to spot by predators and are more likely to survive.

• Predation

• Climate

• Camouflage

•  Competition

A population of beetles lives on tree bark. Birds prefer eating the bright green beetles, while the brown beetles are left alone.

• Predation

• Food Availability

• Disease

• Camouflage

Mountain goats with stronger leg muscles are better able to climb steep cliffs to escape predators, and they reproduce more successfully.

• Predation

• Climate

• Competition

• Human Activity

Due to overfishing, larger fish are caught more often, leaving smaller fish to survive and reproduce.

• Human Activity

• Food Availability

• Competition

• Disease

In a dense forest, only the tallest plants get enough sunlight to survive and reproduce

• Competition

• Climate

• Predation

• Camouflage

Mice with dark fur survive better in forests where the ground is covered in dark soil and leaves. Lighter-colored mice are eaten more often by hawks.

• Climate

• Predation

• Disease

• Food Availability

In a freshwater lake, some fish stay near the surface, while others live near the bottom. A new predator is introduced that hunts near the surface. Over time, more fish are found deeper in the lake.

What is the main selective pressure?

• Climate

• Predation

• Disease

• Competition