Question

Synapsids were derived from early reptiles
A. Pelycosaur, therapsid, and mammals
B. Dinosaur, Thecodonts, and Crocodile
C. Modern reptiles and birds
D. Modern reptiles, dinosaurs and birds

Answer 1

Hint: Synapsids were a group of mammals which are known for their water proof skin feature and the most distinguishing feature about the synapsids were that they did not lay eggs and instead they gave birth to young ones.

Complete answer: Synapsids first appeared around 250 million year ago and from there mammals have evolved. Today's mammals are known for giving birth to young ones and they do not lay eggs. So was the characteristics of the synapsids that they also did not lay eggs. The synapsids earlier were known by the name of pelycosaurs and the therapsids have evolved from the pelycosaurs only.
The body of the synapsids were slender and they bear waterproof skins and also, they had teeth to chew and eat their food. So, if we look at the options and sort out the organisms which have waterproof skin, having teeth and the main thing about giving birth to the young ones.
The birds are common and known to lay eggs, so is the case with the modern-day reptiles. They also lay eggs and incubate them till the eggs hatch. Regarding dinosaurs, the paleontologists have said that the dinosaurs also used to lay eggs.
So, the correct answer is “Option A”.

Note:
The mammals which do not give birth to the young ones and instead lay eggs are known as amniotes and the synapsids have evolved themselves from the amniotes only over the period of time. The dinosaur never gave birth to the young ones as they are from the reptile family.