Select the letter of the correct answer. What is this article mainly about?
A. New research has created a type of exercise machine that
helps astronauts maintain their strength in space.
B. New research suggests that astronauts should not
exercise one to two hours in space unless they have
enough to eat first.
C. New research suggests that accelerated space aging is
temporary and that astronauts' muscles recover after a
few months back on Earth.
D. New research suggests that extended space missions may
be a problem because astronauts become weak when they
spend months in space.

the statement flat characters usually only have one trait that is developed in their story lines is true.

it is grammatically incorrect and is illegible to me and i can not answer it.

comfortable

explanation:

one type of the adjectives is predicate adjective. a predicate adjective is an adjective which follows a linking verb and modifies or refers back to the main subject of that linking verb.

it usually is used just before the noun it modies.

here in this example:

'penguins seem comfortable in the coolest habitats', comfortable is the predicate adjective which follows the linking verb 'seem' and modifies the noun.