Explain why there are more substances on Earth than are listed on the periodic table of elements .

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus