In animal populations, DDT causes _____. (Activity 50A)

DDT is _____-soluble so it accumulates in _____. (Activity 50A)

Which of these is a biotic component of an environment? (Activity 50B)

Desert owls are inactive during the day and active at night. They also have small bodies. This describes _____ adaptation to the hot and dry desert. (Activity 50B)

Horned lizards are desert animals that are active during the day. Their skin and kidneys are efficient at conserving water; when they get hot, they move to the shade so they can cool off. This describes _____ adaptation to the hot and dry desert. (Activity 50B)

Cacti are desert plants with C₄ metabolism. In addition, cacti bloom at night. This describes _____ adaptation to the hot and dry desert. (Activity 50B)

Which of these is characteristic of the photic zone of a freshwater biome? (Activity 50C)

The benthic zone of aquatic environments is defined as the _____. (Activity 50C)

The _____ biome is the largest of Earth's biomes. (Activity 50C)

A(n) _____ is a region where fresh water and salt water mix. (Activity 50C)

What are the two major factors determining the distribution of terrestrial biomes? (Activity 50C)

Which of these biomes is characterized by little rainfall? (Activity 50C)

Which of these is the largest terrestrial biome on Earth? (Activity 50C)

Which biome is characterized by an extensive canopy that allows little light to penetrate to the ground and by the presence of epiphytes? (Activity 50C)

Which biome is characterized by the presence of permafrost? (Activity 50C)