What is the half-life of the radioactive isotopes? a. A radioactive isotope decreased to one-half its original amount in 18 months.

Which of the following statements is true? All animals in the Chordata phylum have dorsal nerve cords. There are far more vertebrates on earth than invertebrates. Sponges are not true animals because they can perform photosynthesis.

Select the correct answer. A cell phone manufacturing company wants to display the average sales of their new phone model for a particular month across six countries. Which method of data representation would be ideal for this? ОА. Bar chart OB.

Ozone molecules are destroyed by a. carbon dioxide molecules. c. deoxyribonucleic acids. b. chlorofluorocarbons. d. ultraviolet radiation

It takes a car 1.75 h to go from mile marker 10 to mile marker 115. what is the average speed of the car? A) 65 mph B) 60 mph C) 183 mph D) 1.6 mph

Viruses are different from bacteria in that

What is true about the absorption and storage of fat-soluble versus water-soluble vitamins in the body? a. water-soluble vitamins can build to toxic levels because they circulate in the bloodstream?

Explain why clear-cutting is a more destructive method of wood harvesting than selective cutting.

Which process changes sedimentary rocks into igneous

Unlike minerals such as iron and calcium, protein is a macronutrient in the human diet. Why is protein a macronutrient?

Energy drinks have become increasingly popular. Somebody's trying to contain large amounts of caffeine which is known to increase heart rate in most individuals. This effect on the heart rate can be Dangerous because it can lead to