Allopatric speciation
1.occurs when two populations exist in the same place.
2.occurs when two populations become separated geographically.
3.occurs only in plants.
4.is not very common.
5.never happens in animals.
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A human plus all of its resident microbiota is a(n) _____
Fill in the blank(s) with the appropriate word(s).
In what process does the aerobic electron transport chain participate?
a) Glycolysis b) Oxidative phosphorylation c) Photophosphorylation d) Substrate-level phosphorylation
Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now experiencing an extinction (loss of biodiversity) crisis?
A) Humans are ethically responsible for protecting endangered species. B) Scientists have finally identified most of the species on Earth and are thus able to quantify the number of species becoming extinct. C) The current rate of extinction is high and human activities threaten biodiversity at all levels. D) Humans have greater medical needs than at any other time in history, and many potential medicinal compounds are being lost as plant species become extinct. E) Most biodiversity hot spots have been destroyed by recent ecological disasters.
While strolling through an arboretum, a very tall tree bearing relatively small pollen-producing cones and short, needle-like leaves catches your eye. What else is also likely true of this species?
A. Its leaf surfaces are protected from desiccation by a thick waxy cuticle. B. It is a monocot. C. Its water-conducting cells are protected from desiccation by tori. D. It produces resin. E. It is pollinated by moths.