HURRY I HAVE A TIME LIMIT! Humans, cats, whales, and bats all have similar arm bones. What piece of evidence for common ancestry does this describe?

-homology
-embryology
-fossil record
-amino acids sequences

The answer would be d because x,y = male and x,x = female so x,y is male so xxy is male with a female trait!

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 : )