skin system______________
举一反三
- Which of the following is derived from the ecotoderm? A: epidermis, lenses of eyes, and nervous system B: notochord, skeleton, and skin C: liver, thyroid, and muscles D: blood, respiratory system, and skeleton
- 英语的“肤浅”是___________________ A: shallow skin B: skin shallow C: deep skin D: skin deep
- A) Skin damage. B) Skin cancer. C) Skin burn. D) Death.
- The _______ is a protein that thickens and toughens the skin and make the skin waterproof.
- skin _______