*Question*
Q: Melting ice and grinding wood into sawdust are examples of what? Choices: - chemical changes - reversible changes - unpredictable changes - physical changes A:
**Answer**
physical changes

*Question*
Q: An external opening in the what of amphibians allows wastes and gametes to exit the body? Choices: - anus - oral cavity - urethra - cloaca A:
**Answer**
cloaca

*Question*
Q: What would you need to see most cells? Choices: - ultraviolet - infrared - mirror - microscope A:
**Answer**
microscope

*Question*
Q: Rh antibodies can prove dangerous if they cross what barrier in pregnancy? Choices: - stomach - fungal - embryo - placental A:
**Answer**
placental