Magnets are not attracted to all materials. Which material would be classified as magnetic?

A) brick
B) iron nails
C) wooden pencils
D) stainless steel fork

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

What type of genetic drift would be simulated if all the beans that were not selected died out?

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation