An adult axolotl salamander (Ambystoma mexicanum) retains the juvenile characteristics of external gills and a tail fin
This is an example of what mechanism?
a. allometry
b. hybridization
c. preadaptation
d. paedomorphosis
e. adaptive radiation
d
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A DNA barcode is being developed for use in conservation biology based on ______
a. mitochondrial genes in plants b. chloroplast genes in plants c. nuclear genes in animals d. mitochondrial genes in animals e. bacterial genes
In the scientific process, the word ________ is reserved for those few major concepts that offer the best explanation to fit a broad range of established facts
Fill in the blank(s) with correct word
In a graphical representation of an organism's population growth in a given habitat, the growth rate for an organism whose population is increasing according to its biotic potential is best represented by a(n)
A) line with a negative slope. B) S-shaped curve. C) flat line (no slope) set at the carrying capacity of the environment. D) exponential growth curve. E) flat line (no slope) set at the equilibrium point of environmental resistance versus biotic growth potential.
Geological evidence indicates that two landmasses, separated by a deep ocean channel, have been moving apart since 45 million years ago. You are studying a group of organisms that has widespread populations on both of the landmasses. Which is the most
likely hypothesis for the group's evolutionary history? A) The group's ancestors were definitely present on the original landmass. B) The group's ancestors cannot have been present on the original landmass. C) If the group's ancestors could not move across the open ocean, it is very likely that they were present on the original landmass. D) The group's ancestors must have independently colonized each of the landmasses from a third location within the past 45 million years.