Enterobius vermicularis is _______.

Which organism, found in contaminated powdered infant formula, can cause neonatal meningitis?

When two organisms attempt to utilize the same resource, the result is:

What is the proposed cause of what many Scientists are calling the “Sixth Mass Extinction”?

A Bill known as the Endangered Species Act designates protection for the critical habitat of an endangered species. The bill defines a species as …”  any subspecies of fish or wildlife or plants, and any distinct population segment of any species or vertebrate fish or wildlife which interbreeds when mature.” Here the term interbreed means to breed with other members of its species, subspecies, or distinct population segment.”  So which of the following species definitions/concepts would be defining species as closely to the way this law is defining it as possible? Please realize that this law would say that a species could be any population which has breeding taking place between its members, even if it occasionally has members who breed with other populations. None of the answers below is perfect, but one would be closest to this legal definition.

Adaptive Radiations are often preceded by large scale extinction events, such as the KT event.

Overall, when we consider the number of animal families over time, the trend since the Cambrian until today has been for that number to __________. 

In terms of speciation, what is “reinforcement”?

Again, you as a hypothetical lobbyist are trying to protect a species and its habitat under the Endangered Species act. You are trying to protect, lets say, the Spotted Owl and its Old Growth Forest habitat from logging and destruction but someone says that because it can interbreed with the Brown Owl in New Mexico, it is not a true species. You counter with the idea that it is a species are defined as the smallest possible group which descends from a common ancestor and carries recognizable derived traits. Your proposal is in agreement with which species concept?  

A marked increase in the allele frequency of a mutation that has no effect on an organisms function, reproduction or fitness and is simply a result of genetic drift would be an example of…