Which substance is considered a teratogen?
a. DNA
b. Estrogen
c. Androgen
d. Lactic acid
e. Nicotine

Is snow a type of precipitation? explain why or why not.

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.