Typical problems related to lack of drug standards are:
a. improper dosage
b. poisoning
c. improper labeling
d. all of the above

D.

Explanation:

Improper dosage, poisoning, improper labeling, are all typical problems.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

can i get the brainliest pls

explanation:

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex