Biologists schleiden and schwann would state that

all cells come from other cells

the smallest living unit is the cell

all living things are made up of a cell or cells

all of the above

The correct answer is all of the above options.

Explanation:

The cell theory was presented by Schwann and Schleiden two biologists in 1839. It was a major advancement for the biological studies back then. The cell theory is there were three component of this theory originally-

All living beings are made up of 1 cell or more cells.

Cells form from already existing cells.

The cell is the fundamental unit of structure, function, and organization in organisms.

Thus, The correct answer is all of the above options.

i'd say that the moon rock is about 2.2 billion years old.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u