In prehistoric times there were many volcanic eruptions in the oceans. Lava spilled into the ocean waters, turning into igneous rock. This was followed by mass extinctions of many organisms attached to the ocean floor. What is the MOST LIKELY reason for this?
A) Contact with the lava killed the organisms.
B) The lava from the volcanoes took the oxygen from the air.
C) In prehistoric times, there were very few organisms living in the oceans.
D) The hot lava from volcanic eruptions changed the temperature of the ocean.

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]