Which type of radiation from the Sun has the greatest potential to harm human skin?

A) Radio

B) Visible

C) Infrared

D) Ultraviolet

The endocrine system incorporates feedback mechanisms that maintain homeostasis. Which of the following demonstrates negative feedback by the endocrine system?

Where on Earth are the longest mountain ranges located? A. on the Continental crust B. the western United States and Mexico C. near the centers of the oceans D. lower parts of Antarctica

The Eastern grey squirrel lives mostly in oak trees that have a medium gray bark. In some cities, oak tree bark is darkening due to air pollution. This Eastern grey squirrel shows melanism, or the increase in black pigment in its fur.

Why is the roof of the Hearst Tower designed to collect rainwater? Check all that apply. 1. to reduce the amount of water dumped into the city's sewer system 2. to replace water lost to evaporation in the office air-conditioning system 3.

For some reason (not yet understood) more male babies are conceived (born) than female. By childhood the number of boys and girls is the same. what is the possible explanation for the higher mortality (both before and after birth) of male babies?

Which substance is used by plants as a source of food? A:water B: glucose C:oxygen D:carbon dioxide

If a tree ring you are measuring is very thick, what does that mean? A. That year was cold and dry B. That year was warm and very dry C. That year was warm and wet D. None of the above

Which of the following represents the treatment option most likely to avoid the evolution of drug-resistant HIV (assuming no drug interactions or side effects) ?

Which of the following connective tissues is richly vascularized and consists of more cells than extracellular matrix? A) Adipose b) Dense regular C) Areolar D) Hyaline cartilage

Humans and apes have five fingers they can use to grasp objects. do you think these are analogous or homologous structures? explain your answer.