Question

read the passage about the history of cell theory
today, we know that all living things are made of cells. but it wasnt until the invention of the compound microscope that cells and previously life could be observed. cell theory, now considered a unifying principle of biology, developed over the course of many years through the contributions of numerous scientists.
robert hooke, an english physicist and microscopist, first described the cell in 1665. hooke used a compound microscope to examine cork. what he saw were many small adjoining
ooms\ that looked like the cells that monks occupied within monasteries. hooke was actually observing the cell walls within cork tissue.
shortly after hooke published his observations in his book micrographia, a dutch scientist and microscope maker named antonie van leeuwenhoek observed moving particles through his single - lens microscope. he assumed that because they could move, these particles must be alive, and he called them animalcules. these particles were, in fact, microorganisms. leeuwenhoek is credited as the first to discover and describe microorganisms like bacteria and protists, and he later became known as the father of microbiology.
over the next two centuries, many scientists studied and contributed to the understanding of cells, their structure, and their function. in the 1830s, after years of studying plants, german scientist matthias schleiden concluded that every structural element of a plant is composed of cells or their products. his friend and fellow german scientist, theodor schwann, reached an analogous conclusion about animals and animal cells shortly thereafter. because animal cells lack cell walls, they were difficult to identify; it was not obvious that they would be as essential to animal tissue as plant cells are to plant tissue. but schwann made a convincing argument for similarities in animal and plant cell structure. together, schleidens and schwanns conclusions comprise the first two tenets of cell theory: all organisms are made of one or more cells, and cells are the smallest unit of structure and function for organisms.
however, schwann and schleiden did not yet understand cell growth. for some time, they hypothesized that new cells \crystallized\ from the material within or between other existing cells. as cell research continued, the scientific community showed that cells form from preexisting cells - the third tenet of cell theory. in 1851, robert remak proposed that cell division is the universal method of cell formation. german pathologist rudolf virchow popularized this idea in 1855 with the latin phrase omnis cellula e cellula, which translates to \every cell from a cell.\
the discovery of the cell and the development of cell theory laid the groundwork for pioneering discoveries across all fields of biology, from genetics to ecology. today, scientists all over the world are still uncovering exciting insights into the structure and function of cells and their parts.
what type of cells did robert hooke observe in cork tissue? select all that apply.
eukaryotic
animal
prokaryotic
plant

Explanation:

Cork is a plant tissue. Plant cells are eukaryotic. Animal cells lack cell walls (which Hooke observed in cork - cell walls are a feature of plant cells). Prokaryotic cells are much simpler and cork cells are not prokaryotic.

Answer:

eukaryotic, plant