the iris, the colored part of the eye, regulates the size of the the opening that controls the amount of light that enters the eye.
a) cornea
b) lens
c) pupil
d) retina

Minute vessels that collect blood from the capillaries and join to form veins are: venoles venules viscera venoids

What is the main structural difference between enveloped and nonenveloped viruses? a) enveloped viruses have their genetic material enclosed by a layer made only of protein.b) nonenveloped viruses have only a phospholipid membrane, while enveloped viruses have two membranes, the other one being a protein capsid.c) enveloped viruses have a phospholipid membrane outside their capsid, whereas nonenveloped viruses do not have a phospholipid membrane.d) both types of viruses have a capsid and phospholipid membrane; but in the nonenveloped virus the genetic material is between these two membranes, while in the enveloped virus the genetic material is inside both membranes.

  when we experience conflict, it threatens our needs to feel