A Rigid Exoskeleton Is Characteristic of

Q26: The thick protein coat outside the plasma

Q27: Animals secrete _ which serve to communicate

Q28: The filaments of vertebrate skeletal muscle that

Q29: Upon being released from the sarcoplasmic reticulum,Ca²⁺

Q30: The outer layer of the mammalian epidermis

Q32: In bony fishes,growth lines in the scales

Q33: The vertebrate skeleton became noticeably strengthened as

Q34: A(n)_ is composed of a core of

Q35: In cartilaginous fishes,the dermis contains bone in

Q36: Most multicellular animals have an integument consisting