A tough waterproofing protein is keratin.The correct option among all the options given in the question is option "A". Keratin is a chemical that is secreted by the epidermal cells and is a protein based substance. This protein based substance helps to make the cells tougher and also makes them resistant to water.
answered: Guest
Can you include the paragraph too ?
answered: Guest
i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /
Which statements about a food chain are true? choose all answers that are correct. a. plants are the first living organisms in food chains on land. b. the plants in a food chain are called herbivores. c. all food chains on land begin with energy from the sun. d. carnivores in a food chain eat only plants.