PLEASE HURYY Suppose cobalt-60 undergoes a type of radioactive decay that does not
change the identity of the isotope. Which type of decay did the isotope
undergo?
O A. Gamma
B. Delta
C. Beta
D. Alpha

2. you__turn left on a red light if you are in the left-most lane of a one-way street, you're turning into the left-most lane of a one-way street, and no nearby sign prohibits the turn.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Can someone me with 3 and 4 plz. this is for masteries test.