Anton van leeuwenhoek is a scientist who saw cells soon after hooke did. he made use of a microscope containing improved lenses that could magnify objects almost 30ox. under these microscopes, leeuwenhoek found moving objects that he named “animalcules,” which included protozoa and other unicellular organisms, like bacteria. he was also able to observe red blood cells and sperm cells. to which of the tenets of the cell theory did leeuwenhoek make the biggest contribution?

What protects the lining of the stomach from acidic gastric juices?

The endoplasmic reticulum (er) is an organelle in some cells. in these cells, it is continuous with the nuclear membrane and forms a large part of the cell\'s total membrane. sort the phrases below as describing rough er, smooth er, both, or neither. note: if you answer any part of this question incorrectly, a single red x will appear indicating that one or more of the phrases are sorted incorrectly.1) found in prokaryites and uekaryotys2) involved in protein synthesis3) involve in lipid synthesis4) contains molecular chaperones in lumen5) bound with ribosomes6) involved in toxin or drug metabolism7) large systemot internnected tubules,vesicles, and sacs8) "packages" enzymes in vesicles for secretion.

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.