Ecosystems that do not undergo periodic fires are much more vulnerable to invader species
Indicate whether the statement is true or false
T
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Which of the following best explains a population pyramid (age-sex pyramid) that looks like an umbrella, with very narrow cohorts at the bottom that widen broadly near the top?
A) The population pyramid is upside down. B) The population is a retirement village. C) The population is a college town. D) Migrants are dominant in the community. E) The population has an open-door migration policy.
____________________ is the ability of the Earth's various natural systems and human cultural systems and economies to survive and adapt to changing environmental conditions indefinitely
Fill in the blanks with correct word
The percentage of the Earth's surface covered by ocean is about
A. 60%. B. 80%. C. 50%. D. 70%. E. 85%.
The _____ in the earth's stratosphere is seasonally centered over Antarctica, but thanks to the Montreal Protocol it is currently shrinking
a. greenhouse effect b. ozone hole c. ice cap d. aurora borealis e. magnetic pole