What type of speciation occurs with the Galapagos tortoises and what type of reproductive barriers do they face?
What will be an ideal response?
allopatric, habitat isolation
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The evolutionary process in which the timing of development is altered so that a sexually mature organism retains the physical characteristics of the juvenile form is called ____
Fill in the blank with the appropriate word.
Celiac disease is an autoimmune disorder which destroys the microvilli of the small intestine. Vitamin B12 can be absorbed by passive diffusion across the microvilli of the small intestine. Consider a patient who has had 10% of their microvilli destroyed. If the concentration of vitamin B is 0.6 pg/ml inside the lumen of the small intestine and 0.3 pg/ml on the inside of an epithelial cell, how
is the diffusion rate of vitamin B altered in this patient? A. It is reduced by 10%. B. It is reduced by .003%. C. It is increased by 10%. D. It is reduced by .3%. E. It is increased by .3%.
Which of the following gives the correct rank order for relative amount of water (most to least) required for excretion of the primary nitrogenous wastes used by different animals?
A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid
Sodium-potassium pumps are examples of what type of cellular transport?
a) primary active transport b) secondary active transport c) transport in vesicles d) facilitated diffusion e) hypertonic transport