Elizabeth was studying the history of the cell theory and the contributions of different scientists. She made this table to compare two of the scientists.

X
Y
observed objects using a microscope observed small organisms using his own version of a microscope
called what he observed "cells” called what he observed "animalcules”
Which pair of scientists should Elizabeth write instead of X and Y?

Schwann and Hooke
Hooke and Schleiden
Hooke and Leeuwenhoek
Virchow and Schwann

Hooke and Leeuwenhoek

Explanation:

Robert Hooke, an English scientist was the first person to see cells under the microscope and give them a name. He made this discovery in 1665 when he observed the bark of oak tree, and saw compartments which he called 'rooms'.

On the other hand, Antonie Van Leeuwenhoek observed living cells which he named 'animalcules'

Thus, X and Y should be Robert Hooke and Antonie Van Leeuwenhoek

Hooke and Leeuwenhoek

Explanation:

Robert Hooke, an English scientist was the first person to see cells under the microscope and give them a name. He made this discovery in 1665 when he observed the bark of oak tree, and saw compartments which he called 'rooms'.

On the other hand, Antonie Van Leeuwenhoek observed living cells which he named 'animalcules'

Thus, X and Y should be Robert Hooke and Antonie Van Leeuwenhoek

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

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