During which period did mammals first appear?a.Pleistoceneb.Carboniferousc.Cretaceousd.Jurassic
Earth’s continents are constantly in motion because they sit on top of gigantic plates which float on Earth’s mantle. Energy from the Earth’s core creates convection currents in the molten layer, and the currents move the plates. Over extremely long periods of time, this movement creates new _______.a.biomesb.platesc.atmospheric layersd.elements
Coral reefs are unaffected by pollution.
The Earth’s history has had a significant effect on the characteristics of its organisms and biomes. How was the Carboniferous period different from the Devonian period? a. Forests and land plants evolved during the Carboniferous period. b. There were vertebrates in the Carboniferous period, but not in the Devonian period. c. There were an increased number of land-based organisms in the Carboniferous period. d. There were vertebrates with four legs in the Devonian period, but not in the Carboniferous. Please select the best answer from the choices provided
How is human impact on the tundra and the rainforests similar?a.Both have been impacted by oil drilling and mining.b.Both have been impacted by logging and mining.c.Both have been impacted by overgrazing and radioactive pollution.d.Both have been impacted by agriculture and oil drilling.
Which of the following is not a way humans have directly impacted coral reefs?a.overfishingb.tourismc.algae farmingd.agriculture
Biomes on Earth have exhibited changes throughout history that have been caused by a variety of factors. Over the past 50 years, the amount of tropical rainforest acreage found throughout the world has decreased from 14.8 billion acres to 8.6 billion acres due to deforestation. What factor is likely most responsible for the changes observed in the world’s rainforests? a. volcanic activity b. human activity c. temperature changes d. solar eclipses Please select the best answer from the choices provided
Humans have impacted the rainforests through mining, agriculture, and construction.
Which of the following is not a way humans have impacted the tundra?a.oil drillingb.loggingc.overgrazingd.mining
Which of the following is a characteristic typically not used to classify biomes? a. climate b. type of vegetation c. human activity d. geography Please select the best answer from the choices provided
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