You are studying population dynamics in three species of small aquatic invertebrates called water fleas. Among these species, which is most likely to exhibit regular population cycles? 

#Question id: 10839

#Section 1: Ecology

Which of the following statements about plants and herbivores is true?

#Question id: 12314

#Section 1: Ecology

#Question id: 12356

#Section 1: Ecology

#Question id: 4647

#Section 2: Evolution

The treeʹs horizontal axis is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V—Z) represent various common ancestors. Letʹs say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species. Which of the five common ancestors, labeled V—Z, has been most successful in terms of the percent of its derived species that are extant?

#Question id: 11858

#General Aptitude

A, B and C start at the same time in the same direction to run around a circular stadium . A completes a round in 252 seconds , B in 308 seconds and C in 198 seconds all starting at the same point . After what time will they meet again at the starting point ?