In a neutral calcium atom, there are 20 protons, 20 neutrons, and 20 electrons. If a calcium atom loses 2 electrons, what will be the calcium atom's charge?

What is the difference between evidence and inference?

Sex chromosomes are: A. the largest chromosomes on a karyotype B. paired homologous chromosomes C. present only after puberty D. the 23rd pair of chromosomes

If you had to pick a specific food that was high in potential energy to include in your diet, which food would you pick and explain how this food is high in potential energy.

Which statement correctly describes how nitrogen in the soil returns to the atmosphere? A. Soil bacteria converts usable nitrogen into nitrogen gas. B. Plants convert usable nitrogen into nitrogen gas. C.

What system works closely with the digestive system?

Why are some motors painted black? A) Black is a standard color code for motors. B) This prevents loss of heat from the motor. C) The motor is hotter than the surroundings and emits heat.

How can these forelimbs explain how life changes over time? Homologous structure of four different animals The illustrations show the vestigial structures of four different species that once had a function in an ancestral organism but no longer have

The extra chromosome which produces Down's syndrome is: Options: an autosome a "X" chromosome a "Y" chromosome either "X" or "Y" chromosome

Why is the. trees green

Sedimentation as a method of water purification results in what