Question

grace is writing an article about mars. read each detail and then select the section where it fits best.
the planet mars is about half as big as earth.
in 1965, mariner 4 became the first spacecraft to visit mars.

Explanation:

For the detail "The planet Mars is about half as big as Earth", it relates to the physical dimension of Mars, so it fits the "Size" section. For "In 1965, Mariner 4 became the first spacecraft to visit Mars", it is about a past event related to Mars' exploration history, so it fits the "History" section.

Answer:

• "The planet Mars is about half as big as Earth": Size (select the circle under "Size" for this detail)
• "In 1965, Mariner 4 became the first spacecraft to visit Mars": History (select the circle under "History" for this detail)