Write a ½- to 1-page paper (about 300 words) describing how pregnancy happens. Include how a couple could avoid pregnancy if they were having vaginal sex and did not want to become pregnant. Make
sure to use the following words from today’s lesson in your paper:
 Sperm
 Semen
 Ejaculation
 Penis
 Egg
 Ovary
 Fallopian tube
 Uterus
 Cervix
 Vagina
 Fertilization
 Implantation
 Conception

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Explain why electric current cannot exist if a current doesn't have a voltage source.

Which planet do you think would be easiest for humans to colonize some day?