The four spheres of Earth constantly interact with each other such that each one affects the others. The depends on resources from other spheres in order to exist.
A. Hydrosphere
B. Lithosphere
C. Atmosphere
D. Biosphere

How are the high islands of the pacific formed? a. by connected coral reefs called atolls b. by lagoons c. by moving glaciers d. by underwater volcanoes

70 pts answer the following questions in full sentences and paragraphs, using at least 150 words, in the essay box below. 1. which organisms are carnivores? herbivores? omnivores? 2. if the ecosystem is balanced, which populations should be the largest? the smallest? 3. imagine a group of hunters kills half of the rabbit population. how will the other organisms be affected? 4. imagine disease kills 85 percent of the wolf population. how will the other organisms be affected? 5. imagine a foreign mountain lion species is introduced into the ecosystem. how will the other organisms be affected?

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic