1. biodiversity frozen layer of soil below the earth's surface
2. biome
number of plants and animals in an ecosystem
3. estuary
transitional area between land and water systems that support aquatic life
4. permafrost
similar ecosystems, such as marine or desert
5. wetlands
place where fresh and salt water meet

(10 points) 1. cone 2. rectangle 3. triangle 4. circle 5. cylinder a. perpendicular cross section of a pyramid b. perpendicular cross section of a cylinder c. parallel cross section of a sphere d. shape created when a rectangle is rotated about the y-axis e. shape created when a right triangle is rotated about the y-axis