Hey. The first sound is the "lub." This is what you hear once the mitral and tricuspid valves of the heart close, which are the valves between the atria and the ventricles! Super cool. It is your third answer choice.
Answer:
sedimentary rocks
Explanation:
can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years. So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil.
Answer:
Photosynthesis is a process in which <u>_heat_</u> energy is converted to <u>____chemical___</u> energy.
Explanation:
It would be A.Evaporation and Condensation
I hope this helps
Have a happy holidays:)
