Why do our muscles behind our ears twitch when we hear a sudden loud noise

Which are produced as a result of meiosis? A zygotes B chromosomes C tetrads D gametes

A baby is born with what the primary care provider believes is a diagnosis of trisomy 21. this means that the infant has three number 21 chromosomes. what factor describes this genetic change?

Which is an effect of an increase in ocean temperature? A. Decreased transpiration B. Decreased evaporation C. Increased percolation D. Increased precipitation

How does gravity keep the planets in orbit the sun?

What is the "fluid-filled sac" that cushions the embryo? A) Amnion B) umbilical C) uterine cavity

Which best explains the difference between a ball-and-stick model of a chemical compound and a space-filling model? Ball-and-stick models can show compounds in three dimensions, but space-filling models cannot.

Which of the following are not allowed on public land?

Prokaryotes that belong to the kingdom Eubacteria and carry out photosynthesis are called

Which law states that each planet revolves so that an imaginary line connecting it to the sun sweeps over equal areas in equal time intervals?

Why do you think keeping salt water shellfish such as clams and mussels in freshwater kills them? support your answer?