1 Select the true statement about the cycling of matter through Earth's ecosystems.
OA. Cycling of matter began around 1976.
OB. Only animals can cause matter to cycle through an ecosystem.
OC. Matter can only move from plant to plant in an ecosystem.
OD. Cycling of matter occurs every day

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

i think it is true since you can test the answer and can use observations to complete it.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este

idk what is it? is this a question that you know the answer or u dont