Comparing the reactivities of lithium (Li) and krypton (Kr) will best disprove this student's idea.
This is defined as a subatomic particle which has a positive charge present in it.
To disprove the claims of the student that you need more protons to have more reactivity, option A was chosen because Krypton has more protons than Lithium, but it is less reactive because it is a noble gas.
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b. precambrian rocks have been changed by heat and pressure
c. precambrian soft-bodied life-forms weren’t often preserved as fossils
d. all of the above
Little is known about much of earth’s early history because Precambrian rocks have been deeply buried they have been changed by heat and pressure ,Precambrian soft-bodied life-forms weren’t often preserved as fossils.
What is Precambrian rocks?
The Precambrian is the earliest part of Earth's history, set before the current Phanerozoic.
Why are Precambrian rocks rare?
Fossils are rare in Precambrian rocks mostly because Precambrian life-forms lacked bones, or other hard parts that commonly form fossils.
Hence, D is correct option
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Explanation:
Magnet has two poles: (1) North pole and (2) South pole.
Like poles repel each other. If the like poles are interacting each other then there will be force of repulsion in between these poles.
Unlike poles attract each other. If the unlike poles are interacting each other then there will be force of attraction in between these poles.
S-S and N-N magnetic poles repel each other.