Create an account
Darwin was inspired by these to think about evolution
Books, fossils, adaptations of organisms to the environment, and unique organisms on the Galapagos Islands
Microorganisms can adapt to changes in the environment by means of mutation alone because
They multiply so rapidly
Why are species most commonly identified by their appearance?
This is the most convenient way of identifying species
A new species can arise in a single generation if
a change in chromosome number creates a reproductive barrier
Evolution occurs in spurts; species evolve relatively rapidly, then remain unchanged for long periods, according to what?
Punctuated equilibrium model
individuals of different species living in te same area may be prevented from interbreeding by responding to different mating dances
It is unlikely that the human opulation will give rise to a new species becaues
geographic isolation is unlikely to occur
What do the excretory, digestive, and respiratory systems have in common?
The contain specialized surfaces for exchange with the environment
A change in the body often triggers a response that counteracts the change. What is this known as?
When you sprain your ankle, the "straps" of the tissue that hold the bones together are stretched and torn. What kind of tissue is damaged?
fibrous connective tissue
What forms a thick protective barrier that keeps bacteria out of the body?
stratifies squamous epithelium
_______ are needed in the diet as components of teeth and bone, regulators of acid-base and water balance, and parts of certain enzymes.
Would a carnivorous animal or an herbivorous animal be more likely to have a longer digestive tract?
The herbivorous animal
Why are bird lungs more efficient that human lungs
they have a one-way air flow system, rather than and in-out system
An advantage of gas exchange in water as compared to water is...
the respiratory system will not dry out in water
Most oxygen is carried by the blood_____, most CO2 is carried by the blood_______.
attached to hemoglobin...in the form of bicarbonate ions.
The _____ is the structure specialized for diffusion of gases and nutrients between the blood of the mother and the fetus.
Which of the following cannot move freely in and out of a capillary-sugar, O2, CO2, water, plasma proteins.
Put the following in the correct order that traces electric impulses that trigger a heartbeat-atria,ventricles,AV node,pacemaker.
pacemaker,atria,AV node, ventricles.
If cells are not receiving enough oxygen, a hormone signlsthe bone marrow to produce more
In a fish, blood circulates through____ circuits, while in a mammal, it circulates through ___ circuits.
When exercising, _________________ allows greater blood flow to the skeletal muscles.
relaxation of muscle in walls of arterioles
What is the coorect route of urine from the kidney to outside the body-bladder, ureter, urethra
ureter, bladder, urethra
An advantage of excreting uric acid is that it ____, but a disadvantage is that it____.
saves water....costs energy
Filtrate is refined and concentrated by the processes of _______, forming the urine that leaves the body.
re-absorption and secretion
Researchers have found increased levels of hormones from the ____ glands in the blood of students preparing for final exams. These hormones are released in response to stress.
A hormone from the parathyroid glands works in opposition to a hormone from the ____ to regulate___.
thyroid gland....blood calcium
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together