What has happened to the joints of a person with arthritis?
joints became inflamed
O joints became tougher
joints became softer
joints became more cartilaginous

joints became inflamed

Explanation:

Arthritis is an inflammation of the joints.

typically, most spiders possess eight eyes. however, others have as many as 12, and some don't have any. these eyes are for detecting light from dark, deciphering shapes and for gathering their prey.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: