Swimming alone a. increases the benefits of swimming for cardiorespiratory endurance. b. is acceptable in a pool but never in a lake or an ocean. c. is ok as long as you've been swimming for at least five years. d. is never safe, regardless of ability.

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

Which element provides strength to the exoskeleton of clams and oysters

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer