A sample of a radioactive element has a mass of 80g. how much parent and daughter materials are in the sample after two half lives?

What precent of the population has a straighht hair line?

Why do you think meteorologists use a cone-shaped area for the hurricane's path instead of a straight line?

Why is it so hard to define a virus as living or non living?

An ecologist observes that the diet of a bird species consists primarily of large grass seeds (as opposed to smaller grass seeds or the seeds of other herbaceous plants found in the area).

Which of these products is formed during the metabolic reactions of cellular respiration A. Fructose B. glucose C. Oxygen D. Water

Which of these is an example of an endoparasitic relationship? O A. A tapeworm living in an animal's intestine O B. A rabbit eating lettuce in a farmer's garden O C. A tick living in an animal's fur coat O D. A snake eating a mouse in a cornfield

Why is the presence of organic material in the soil important? A) It wards away plant eating organisms. B) It increases plant growth. C) It increases sunlight absorption. D) It increases water absorption.

Which derived characteristic is shared by at least four organisms? Large brain Lungs Mammary glands Placenta

Question 2 For an object to remain at rest, which of the following must be true? A. The forces on it are balanced B. There is no friction C. Gravity doesn't act on it D. The object has no mass

Identify another invertebrate chordate other than hagfish.