In order to control random cracking most effectively, contraction joints in slabs on grade should be cut to a minimum depth of the slab thickness or a minimum of 25 mm (1 in.) deep. A. One-eighth B. Three-eighths C. One-fourth D. One-half

C

Explanation:

C. One-fourth

The statement above is FALSE.

The mark and recapture method of determining population size is not always more effective than the sampling method. The mark and recapture method involves capturing organisms from a particular population, marking them and then releasing them to go. This method is usually used to estimate the number of individuals in a population in a situation where it is not practical to count the whole population.

The sampling method involves using quadrats to count the specific amount of individuals in a particular population. This method is usually used to estimate the number of plant species or small organisms such as insects in a particular environment.