Why are orcas having trouble reproducing?

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?

Which material is commonly used as a culture medium for living cells

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.