What type of "root" did the first vascular land plants have, and what type of environments did they live in?
Seedless vascular plants did not have true roots, they had rhizomes, which were the underground part of the stem. The rhizome transferred water from the soil to the plant and anchored the plant to the ground. They lived in low, wet, marshy, freshwater environments.
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What causes a tsunami?
A) a volcano B) orographic precipitation C) a monsoon D) an offshore earthquake E) climate change
Shale differs from mudstone in that
A. shale is visibly layered and fissile; mudstone is massive and blocky B. shale has larger grains C. shale has smaller grains D. There is no difference between shale and mudstone.
Fortunately for life, oxygen levels in the atmosphere have been stable over Earth’s history
a. True b. False
Which of the following rivers flows inside the Grand Canyon?
A) Nile River B) Colorado River C) Mississippi River D) Amazon River