A/an is a type of research that involves observation and collecting data but does not include a control. a. independent variable b. experimentation c. dependent variable d. investigation

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

What does the symbol (–hfus) indicate in a phase change?

The reactions of photosynthesis occur in the of plant cell? a. mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll