What structures in the brain must develop by the age of ~4yrs old in order to form lasting memories?

Which of the following statements most accurately describes convergent evolution? the process in which two similar species evolve separately from each other and share similar characteristics the process in which a single species evolves into two or more new species the process in which two entirely different species evolve in response to each other the process in which two different species evolve separately from each other but still share similar characteristics

In which layer do organisms on earth love?

What happens during the experiment stage of the scientific method