What was the effect of volcanoes on the Earths early atmosphere? a) volcanoes released gases to form the atmosphere
b) volcanoes released water vapor
c) volcanoes released gases and water vapor
d) volcanoes changed the landscape

Humans are said to be at the top of the food chain because they eat plants and animals of all kinds but are not eaten consistently by any animals. The human food chain starts with plants. Plants eaten by humans are called fruits and vegetables, and when they eat these plants, humans are primary consumers.