Question

1. what did schwann and schleiden discover in the 1800s?

both plant and animal tissues are made up of cells
all cells contain chromosomes
only plants are made of cells
animal cells have a cell wall

Explanation:

In the 1800s, Schleiden studied plant tissues and found they were made of cells. Schwann studied animal tissues and also found they were made of cells. Together, they proposed that both plant and animal tissues are made up of cells. Animal cells do not have a cell wall (plants do). Not all cells (like prokaryotic cells) have chromosomes. And it's not just plants made of cells - animals are too.

Answer:

Both plant and animal tissues are made up of cells