A key factor in the ability of ecosystems to provide ecosystem services is ________
A) the presence of essential abiotic factors
B) the presence of both renewable and nonrenewable resources
C) a sustainable energy cycle
D) the maintenance of a high level of diversity of species
E) a steady rate of growth of the ecosystem
D
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What is the transitional organism from invertebrates to vertebrates?
A) Ophiuroids B) Echinoids C) Salps D) Amphioxus
Some carcinogenic substances occur naturally in the environment, rather than being produced by human industrial activity
Indicate whether the statement is true or false
What is the major distinction between internal and external Earth processes?
A) Internal processes involve heat, and external processes involve oxygen. B) Internal processes can only occur inside the Earth, but external processes can occur inside or outside the Earth. C) Internal processes are driven by things like Plate Tectonics, and external processes are driven by the sun. D) Internal and external processes can occur inside and outside the Earth, but external processes must also include the oxidation of Earth materials.
A(n) _____ is a linear or arcuate deformation belt in which many of the rocks have been metamorphosed by intruded magma
A)orogen B)craton C)greenstone belt D)supercontinent E)midcontinent rift