Mammalian evolution began with the evolution of the first synapsids. what is the defining synapomorphy of synapsis?
a. the possession of the amniotic egg
b. a single temporal fenestra
c. the dentary squamosal joint
d. respiration with a diaphragm
e. endothermic metabolism

b. a single temporal fenestra

Explanation:

Synapsids have a temporary fossa in the lower part of the temporal bone. These reptiles mamiferoides only have a single inferior temporal fenestra.

The synapsids were the first amniots to diversify and appeared  in the middle of the Carboniferous. These first synapses were characterized by the presence of a single temporary fenestra behind each orbit, through which the mandibular muscles pass.

d) II, III, IV, V, Rx, OTC

Explanation:

Based on its potential lethality, harm, addiction potential etc. drugs can be divided into five groups (drug schedule). Schedule I drugs are most restrictive and are not used in treatment and have extremely high addiction potential (heroin, for example). They are illegal substances and are not used in medical treatment. Going down to schedule V drugs are becoming less and less harmful and restricted with less potential for abuse.

Rx drugs are the ones that require a prescription in order to be purchased in the pharmacy.

OTC drugs are, so-called "over the counter" drugs, which can be purchased without prescription, making them the least restrictive.

So, the correct streak, from most to least restrictive drug, is:

II -> III -> IV -> V -> Rx -> OTC