The trace metal iron is required for photosynthesis and nitrogen fixing enzymes. Indicate whether the statement is true or false
ANS: T
Although iron is only required in small amounts, it is essential for energy processes. Plants cannot
undergo photosynthesis without trace elements like this. Information can be found in the section
Elements Cycle between Living Organisms and Their Surroundings.
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The early Earth separated into different layers as a result of differentiation. What were the three basic layers of the interior of the early Earth?
What will be an ideal response?
Which of the following correctly gives the order of boiling points for the molecules pentanol, ethyl propyl ether, and hexane?
A) hexane > ethyl propyl ether > pentanol B) hexane > pentanol > ethyl propyl ether C) pentanol > ethyl propyl ether > hexane D) pentanol > hexane > ethyl propyl ether
Downbursts from a thunderstorm ____
a. ?create high surface winds that extend in every direction from the center of the burst b. ?are a hazard to air traffic but dissipate before reaching the ground c. ?can only form from pockets of cold, dry air d. ?are most common on the trailing edge of a thundercloud e. ?are a wind effect that is not linked to rainfall
____________________ is a significant rise in extinction rates above the background level
Fill in the blanks with correct word