A person first learns to speak Spanish. Then they learn French. When Spanish interferes with their recall of French, this is called ______.

Biologist Charles Darwin proposed the concept of _____, which was the principle that organisms that possess adaptations survive and reproduce at a higher rate than do other organisms

Fill in the blank with correct word

Graying and thinning hair are ____________

a) primarily genetically determined b) benign processes c) show wide variation in terms of age d) All of the above