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what are two examples of humans changing living things? and what is it called when people change the size and shape of living things? and why are living things like Giant ground sloths, Sabre tooth cats and ameonites have completed disappeared?
Fossils are preserved remains or traces of ancient organisms. Which of the following is not an example of a fossil? Quartz vein in a lump of granite / ammonite shells embeddded in stone / insects trapped in hardened amber
The trait that increases the gas exchange efficiency of fish gills is the
a. Unusually high velocity of blood flowing through the gills due to the pressure required by having only one ventricle
b. Back-and-forth movement of water that maximizes oxygen uptake
c. Largest respiratory surface of all vertebrates
d. High degree of oxygen saturation in water
e. Blood flowing through the gills in the opposite direction of water flowing over the gills
Which type of cell division is responsible for variability among members of a species, mitosis or meiosis? Why?
The figure below depicts the relationship between fitness and phenotype (“character”), and how this relationship changes from Time 1 to Time 3 as the environment changes. “X” represents that average value of the character in a population. Selection is acting on this population in Time 1, moving the value of X towards maximum fitness. a) assuming at this point that selection is the only force acting on the population, explain why X gets “stuck” towards the left of the graph (a low value of the character) even as, by Time 3, a high value for the character confers the highest fitness . b) if other forces could act on this population, which one(s) could drive the population mean for the character to the right (to the global optimum)?
what is the evolutionary and biological significance of bilateral symmetry?
Which of these causes increased output of urine
A low blood pressure
B high reabsorption from collecting duct
C low water content in the body
D lowered osmotic pressure
The only taxonomic category that has a real existence
what are 3 adaptations that animals have that plants do not have?
What four things must be true for humans to be evolving by natural selection to become smarter? For each of the four things, what data is there to support it? If there is no data what could be done to justify or refute the point?
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