Which of the following is the main evidence of life in the early universe?

A) photosynthetic bacteria

B) remains in amber

C) dinosaur fossils

D) rock impressions

What is the role of the sun in the water cycle

Why is the atomic mass of many elements not a whole number? a. elements are unstable. b. an element may have isotopes with different numbers of neutrons. c. the atomic mass includes all the electrons. d. isotopes are always expressed in decimals.

How many carbon atoms are present in 1.00 mole of methane ch4?

A radioisotope is placed near a radiation detector, which registers 80 counts per second. Eight hours later, the detector registers 5 counts per second. What is the half - life of the radioactive isotope

Which of the following statments is true regarding the wave mechanical model of the atom? a. Orbitals describe how an electron moves in an atom. b. Orbitals give a probability map of where it is likely to find an electron in an atom. c.

Calculate the ratio of effusion rates of oxygen (o2) to hydrogen (h2)

4. You are studying the behavior of a perfluorocarbon-based O2 carrier as an emergency treatment for hypoxemia. It has an approximate molecular radius of 2 nm.

Of the four methods of heat transfer: conduction, advection, convection, and radiation, which one is considered the most important method of heat transfer?

Which of the following is true of the water molecule? A. It has a linear shape and is polar B. It has a bent shape and is polar C. It has a linear shape and is not polar D. It has a bent shape and is not polar

Calculate the number of repetitions of the β-oxidation pathway required to fully convert a 18-carbon activated fatty acid to acetyl-scoa molecules.