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Earth's tilt on its axis
vertical air circulation
global wind patterns
changes in the Earth's distance from the sun
ocean currents
investigating how an elk population competes for food
observing interactions among various organisms in a rainforest canopy
the relationship between finch beak size and food availability on two different Galapagos Islands
identifying food sources for an egret population
investigating how the amount of annual precipitation affects the distribution of a tree species
competitors and predators
predators and parasites
water and temperature
temperature and sunlight
wind and water
a set of similar communities
a major type of biosphere
a specific set of abiotic factors
a major type of ecosystem
an area with a uniform distribution of organisms and abiotic environmental conditions
The effects of disturbance on a community are almost always negative.
A healthy community is in an equilibrium state of balance, with few disturbances.
Disturbances can create patches of different habitats in a community.
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