Sort the following steps into the correct sequence in which life evolved on Earth.
What will be an ideal response?
Answer: The earliest life forms were single-celled organisms. After that came the eukaryotes, which were more complex. Next came oxygen breathers after the Great Oxygenation Event. Finally, multicelled organisms formed.
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Around 4 billion years ago Venus could have been more Earth-like with liquid water on its surface because
A) Venus has a protective magnetic field B) its atmosphere was thinner C) Venus was farther from the Sun D) the Sun was dimmer so Venus would have received less radiation
The x-rays that occur when a high energy electron beam is incident on a metal target will show what type of spectrum?
a. continuous b. line c. continuous spectrum superimposed with a line spectrum d. absorption
What is the phase difference when two waves, traveling in the same medium, undergo constructive interference?
a. 270° b. 180° c. 90° d. 0°
Helium condenses into the liquid phase at approximately 4 K. What temperature, in degrees Fahrenheit, does this correspond to?
a. ?182 b. ?269 c. ?118 d. ?452 e. ?484