Question

look at these details from a paragraph about the same topic.

• cactus plants have shallow roots that spread out wide to capture a lot of water.
• because cactus plants dont have leaves, they hold on to water longer.
• the stem of a cactus plant can stretch to hold on to more water.

(choose the main or central idea that ties all these details together.)
cactus plants have special ways to survive in places without much water.
cactus plants have special roots to gather more water.
some desert plants have long roots to collect water.
the spines on a cactus plant help shade it from the hot sun.

Explanation:

The details describe cactus water - gathering and water - holding features for arid survival.

Answer:

Cactus plants have special ways to survive in places without much water.