Q: Q: Parasitic leeches feed off of what?    Choices:  - brain  - tissue  - tumor  - blood  A:
A: blood


Q: Q: What do sharks use to secrete salt to assist in osmoregulation?    Choices:  - ceramic gland  - bladder gland  - blood gland  - rectal gland  A:
A: rectal gland


Q: Q: What system lets flatworms maintain a proper balance of water and salts?    Choices:  - homeostasis  - nervous  - digestive  - excretory  A:
A: excretory


Q: Q: Passive immunity arises from the transfer of what to an individual, without requiring them to mount their own active immune response?    Choices:  - parasites  - bacteria  - viruses  - antibodies  A:

A: antibodies