What is another path carbon can take to enter ocean waters besides from the atmosphere? Phytoplankton produce the majority of the oceans’ carbon dioxide.
Rivers pick up carbon from land and carry it to the oceans.
Rainfall carries carbon dioxide from the clouds.
Marine mammals produce most of the carbon dioxide when they breathe.

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods