Calcium has an atomic number of 20; therefore, calcium has 20

protons

protons plus neutrons

shells

Which answer below correctly orders the tempo markings from slowest to fastest?

Which of these resources is directly used in the manufacturing of nearly everything you use? OA) air OB) soil OC) water OD) plants

Two external features shared by amphibians and fish

Read this excerpt from Holes. At the time, Elya thought nothing of the curse. He was just a fifteen-year-old kid, and "eternity" didn't seem much longer than a week from Tuesday.

DDT was widely used as a pesticide for 20 years. It's use was banned after studies showed severe side effects were evident in humans, the environment, and animals as a result of DDT, which reason best explains why the side effects of DDT were so

What do scientists think the main cause for global warming is?

Which organelle is the "post office" of the cell? * nucleus endoplasmic reticulum golgi apparatus cell membrane

Imagine that you want to breed a species of rose that has a wonderful smell. You have many different types of roses, but none of the individual roses has the wonderful smell that you want.

Which term refers to contrasting forms of the same gene

As a mouse undergoes respiration, it produces lactate. This type of respiration can be classified as acidic alcoholic aerobic anaerobic