Four scientists investigated passive smoking. The table below shows the number of people each scientist studied from each group.

Which scientist is likely to get the most reliable results?
Olga
Harry
Peter
Mary

cats appear to have glowing cat eyes because the back of their eyeballs includes a special reflective surface called the tapetum lucidum. this lets them see better during the night, giving them a much better vision.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: