When nonlethal effects of chemicals are studied, such as a chemical having neurotoxic attributes, the dose that causes 50% of the individuals to display the effect is known as the?

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

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.

Depression.is hereditary true or false