A biology student is studying ground squirrels in a local park. She has captured, measured, and released many ground squirrels from an upland, rocky, wooded area, and many similar ground squirrels from a shrub area in soft soil near a stream. She is measuring skull dimensions, leg and claw lengths and shapes, and other traits of the ground squirrels from each collection area. She is involved in
A. phylogenetics.
B. genetics and inheritance.
C. speciation.
D. All of the answer choices are correct.
E. taxonomy.
E. taxonomy.
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Freshwater fishes deal with the osmotic stress of living in hypoosmotic conditions in part by ____
a. active transport of ions into the body through the gills b. excreting nitrogenous wastes through their kidneys as urea c. active transport of ions out of the body by chloride cells d. excreting excess salt through the actions of specialized salt glands in their heads e. maintaining high levels of urea and trimethylamine oxide in body fluids
Explain how proprioceptors work
What will be an ideal response?
Which of the following is a modified fatty acid?
a. prostaglandin b. cyclic AMP c. thyroid hormone d. epinephrine e. melatonin
What is the function of Sertoli cells?
What will be an ideal response?