A and B are definitely true but the other two are false. An earthworm does not survive if cut in half. If cut in exactly the right place and without too much other damage, the front part MAY survive but the tail end will die. The oceans only hold about 1% of the earth's living biomass. 80% is made up of land based plants alone.
Therefore, A. and B. are true, but C. and D. are false.
Therefore, A. and B. are true, but C. and D. are false.