*Question*
Q: What is the only substance on earth that is stable in all three states? Read this paragraph and choose the correct option from the provided answers: Water is the only substance on Earth that is stable in all three states. Choices: - carbon - mercury - air - water A:
**Answer**
water

*Question*
Q: What do you call the first cell of a new organism? Read this paragraph and choose the correct option from the provided answers: Cells divide repeatedly to produce an embryo. Previously the one-celled zygote (the first cell of a new organism) divided to make two cells (a). Each of the two cells divides to yield four cells (b), then the four cells divide to make eight cells (c), and so on. Through cell division, an entire embryo forms from one initial cell. Choices: - embryo - starter cell - egg - zygote A:
**Answer**
zygote

*Question*
Q: Scientists did not actually see viruses until what was invented? Read this paragraph and choose the correct option from the provided answers: Scientists did not actually see viruses for the first time until the 1930s. That's when the electron microscope was invented. The virus shown in Figure below was the first one to be seen. Choices: - magnifying glass - electronic scale - telescope - electron microscope A:
**Answer**
electron microscope

*Question*
Q: What is the attraction of a particular atom for the electrons of a covalent bond called? Read this paragraph and choose the correct option from the provided answers: Choices: - conductivity - ionization - electromagnetism - electronegativity A:
**Answer**
electronegativity