Based on the context, in paragraphs 2 and 5, membrane refers to–cells of of different different sizes.,, cells of diffrent sizes
organisms that that consist of only one cell.
a thin, soft, pliable sheet or layer.
large, efficient cells.

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )

Predator instincts is what causes it

The correct answer is  b)