Chapter 31
Animals that have no particular symmetry exhibit
asymmetry
Jaws are believed to have evolved from the
first pair of gill arches
Learned behavior that causes a family of baby ducks to follow their mother is called
imprinting
All the members of the same species that inhabit a particular area are termed a(n)
population
Fungi and bacteria are detritus-feeders, also known as
decomposers
The term deuterostome refers to
the second embryonic opening becoming the mouth
In vertebrates, the _______ is/are usually replaced by ________.
notochord; a vertebral column
A female peacock spider will only choose a mate with the proper markings and who performs the proper mating ritual. This is an example of
sexual selection
A number of populations of different species interacting with one another in a natural environment, such as a rotten log, is called
An ecosystem consists of what two components?
Why are real bath sponges so soft?
The harder silica or calcium spicules are absent and the softer spongin
remains.
True or False: All mammals have an embryo that develops with a placenta.
False
Siblings who are not identical twins have a genetic relatedness of ____________
1/2
When the number of births exceeds the number of deaths, this results in
population growth
True or False: A bird that lives in a forest is a part of the forest ecosystem.
True
Which of the following organisms exhibit radial symmetry as adults?
cnidarians
Name 3 of the 5 defining characteristics of chordates:
gill arches or pharyngeal pouches, dorsal tubular nerve cord, notochord, and
postanal tail
The mating strategy in which a female mates with multiple males is
polyandry
A population expanding at the rate of 2 - 4 - 8 - 16 - 32 - 64...etc., is in (type of growth)
exponential growth
What part of a food chain/web is NOT recycled?
energy
What are the three consistent structural elements of a mollusc?
a mantle, visceral mass, and a foot
An animal that is characterized by vertebrae, dorsal hollow nerve cord, hair, and mammary glands must be a
mammal
A nephew has a genetic relatedness of ____________ to an uncle?
1/4
In a species with a type III survivorship curve, individuals die when in their lifespan?
early in life
In what form is energy released as it moves up a food chain/web?
Heat