State whether the following set is finite or infinite:
The set of circles passing through the origin $(0,0)$.

Given the sets $A = \{1, 3, 5\}$,$B = \{2, 4, 6\}$,and $C = \{0, 2, 4, 6, 8\}$,which of the following sets can be considered as a universal set for all three sets $A$,$B$,and $C$?

Show that the set of letters needed to spell "$CATARACT$" and the set of letters needed to spell "$TRACT$" are equal.

Write the following set in roster form:
$D = \{ x : x \text{ is a prime number which is a divisor of } 60 \}$

Let $A = \{1, 2, \{3, 4\}, 5\}$. Which of the following statements is incorrect and why? $\{ \{ 3, 4\} \} \subset A$

State whether the following set is finite or infinite:
The set of animals living on the earth.