Plz help me fill in the blanks I need to do this in 5 minutes and I need 3 or more people to help me with it and if you get it right I will choose your's the brainiest answer.

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

If you relate the doppler effect on sound to the color of light waves, a police car would be the color as it approaches and the color as it recedes away from the observer.