Which of the following do scientists use to reinforce the integrity of their scientific investigations and reported data? i. experimenter bias ii. peer review iii. publication in journals iv. replication of trials

9. the history of life on earth is recorded in

Which of the following is an abiotic factor in an ecosystem? a. bacteriab. airc. niched. grass(abiotic=non-living) me !

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources