Your answer should look something like this:

and; however; and; So; however; as well as

Here is the paragraph with the conjunctions highlighted:

Often the early evolution of dinosaurs is an overlooked part of their tale, ignored in favor of the more dramatic tales of their later extinctions. It is also a fairly poorly understood part of their evolution; the timing and actual mechanism that drove them to become the most successful land group ever is still somewhat a mystery. We are, however, learning more and more about this important phase of their history: the time known as the Late Triassic, which took place some 231–201 million years ago. A new fossil site from this time in Poland is helping to fill in the blanks.

So what is present in this new site? One animal is known as a silesaurid—a weird reptile from a group of dinosaur-like relatives called a dinosauriform, known just from a thigh bone. Another is probably one of the most ancestral theropod dinosaurs, typically known from South America, called a herrerasaurid; however, there’s still some debate about what position these guys occupied around the origin of dinosaurs. Other specimens include a definite theropod dinosaur (known from parts of the hip bones) as well as a neotheropod (known from a portion of the tibia).

Your answer should look something like this:

of; of; in favor of; of; of; about; of; ago; from; in; in; in; as; from; of; from; of; from; about; around; of; from; of; from; of

Here is the paragraph with the prepositions highlighted:

Often the early evolution of dinosaurs is an overlooked part of their tale, ignored in favor of the more dramatic tales of their later extinctions. It is also a fairly poorly understood part of their evolution; the timing and actual mechanism that drove them to become the most successful land group ever is still somewhat a mystery. We are, however, learning more and more about this important phase of their history: the time known as the Late Triassic, which took place some 231–201 million years ago. A new fossil site from this time in Poland is helping to fill in the blanks.

So what is present in this new site? One animal is known as a silesaurid—a weird reptile from a group of dinosaur-like relatives called a dinosauriform, known just from a thigh bone. Another is probably one of the most ancestral theropod dinosaurs, typically known from South America, called a herrerasaurid; however, there’s still some debate about what position these guys occupied around the origin of dinosaurs. Other specimens include a definite theropod dinosaur (known from parts of the hip bones) as well as a neotheropod (known from a portion of the tibia).

Your answer should look something like this:

the; an; the; a; the; the; a; the; the; A; the; a; a; a; a; the; a; the; a; the; a; a; the

Here is the paragraph with the articles highlighted:

Often the early evolution of dinosaurs is an overlooked part of their tale, ignored in favor of the more dramatic tales of their later extinctions. It is also a fairly poorly understood part of their evolution; the timing and actual mechanism that drove them to become the most successful land group ever is still somewhat a mystery. We are, however, learning more and more about this important phase of their history: the time known as the Late Triassic, which took place some 231–201 million years ago. A new fossil site from this time in Poland is helping to fill in the blanks.

So what is present in this new site? One animal is known as a silesaurid—a weird reptile from a group of dinosaur-like relatives called a dinosauriform, known just from a thigh bone. Another is probably one of the most ancestral theropod dinosaurs, typically known from South America, called a herrerasaurid; however, there’s still some debate about what position these guys occupied around the origin of dinosaurs. Other specimens include a definite theropod dinosaur (known from parts of the hip bones) as well as a neotheropod (known from a portion of the tibia).