What is the purpose of the oil on the oil immersion lens?

Which structure in the cardiovascular system connect arteries to veins?

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

As scientists have investigated evolution from a variety of fields, they have found that some of darwin's orginal ideas were inaccurate or incomplete. t explanation provided by evolution was updated each time to reflect the new information they found. what does this suggest about the theory of evolution? it has become a stronger and clearer theory as new information is collected.