How does frog respire with the help of skin

Explanation

(1)Respiration through skin is called cutaneous respiration.
(2)This type of respiration is seen in some invertebrates and vertebrates
(3)In frog, skin is an additional or secondary or accessory respiratory organ. (Similarly Earthworm also respires through skin only. It lives in moist places only )

(4)Frog keeps their skin moist . Skin has a large number of mucus glands which secrete mucus onto the surface of the skin.
(5)The mucus layer retains water and reduces evaporation of water from body .
(6)Frog skin is supplied with a large number of blood vessels which help in absorbing oxygen from the water.