Question

living organisms can be classified as prokaryotes or eukaryotes. which two structures are common to both prokaryotic and eukaryotic cells? cell membrane and nucleus plasma membrane and cytoplasm cell wall and chloroplast cell wall and nucleus which scientist discovered cells after observing a thin piece of cork under a microscope? hooke schwann van leeuwenhoek virchow

Explanation:

1. Prokaryotic cells lack a nucleus, cell - wall is not present in all eukaryotes and chloroplasts are mainly in plant eukaryotes. Both prokaryotic and eukaryotic cells have a plasma membrane (also called cell membrane) and cytoplasm.
2. Robert Hooke observed a thin piece of cork under a microscope and first used the term "cells". Schwann contributed to cell theory, van Leeuwenhoek was the first to observe living cells, and Virchow made contributions to cell theory about cell - division.

Answer:

1. Plasma membrane and cytoplasm
2. Hooke