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

you know they are heterozygous for a trait because they have it as jj or jj.