Areoles are the tissue that make up most of the stem of cacti. These are specialized structure that give birth to flowers and are often tubular and multipetaled. This structure enables the plant to survive in the harsh conditions of the desert and help them absorb water from the soil efficiently.
The movement is a called a reflex, which is a sudden muscle movement in response to a stimuli. The reflex you are describing is a reflex known as a plantar reflex, which is present in infants and children but goes away before adulthood (ideally).
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C. Salt marshes are not productive habitats
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I believe it's D. the skeleton protects the brain and the spinal cord.
