how do you think the amount of atmospheric CO2 has changed in the last 550 million years, and how has this affected Earth’s climate

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

What are the names of these two interactions with cattle and how do they differ from each other

Calculate the h3o+ concentration in a solution of acetic acid if the concentration of molecular acetic acid present at equilibrium is 9.97x10-3 m and k for the dissociation is 1.86x10-5. ch3cooh(aq)+h2o(l)+> h3o+(aq)+ch3coo-(aq) show me how to get the answer.