5. Astronomers study stars, planets, and
other heavenly bodies

That is TRUE.

Overpopulation puts a tremendous strain on resources. If too many people live in a place with too few resources (food, water, etc.), there are many negative effects. The biggest concern is access to water. A lack of fresh water can lead to unsanitary living conditions, which can cause disease, infection and increased child and infant mortality. Additionally, overpopulation can lead to malnutrition and increased transmission of diseases. Even more disconcerting is the fact that overpopulation is a growing issue; by 2050, the projected population of the world is 9 billion, with the developed world comprising the majority of the population.