The tropical rain forest biome is characterized by:
a. high density of plants, but nutrient poor soil.
b. high density of plants and nutrient rich soil.
c. low density of plants due to nutrient poor soil.
d. low density of plants, yet nutrient rich soil.
e. intermediate density of plants and intermediate nutrient supply.
A
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Select the pairs of organism characteristics that are homologous structures. Check all that apply.
_____ cactus spines; tree leaves _____ human hand bones; whale fin bones _____ bat wing; butterfly wing _____ octopus eye; mouse eye
In addition to causing skin cancer later in life, ultraviolet light destroys the B vitamin folate. Folate deficiencies in pregnancy may result in birth defects
Which of the following do you think is a stronger selective pressure for high skin pigmentation in high UV environments? A. skin cancer prevention B. birth defect prevention C. both are equal
Formulate reasons in support of why the duodenum could be described both structurally and functionally as the "crossroads" of the digestive tract
What will be an ideal response?
Predict what would happen if the proximal convoluted tubule of the nephron lost its ability to reabsorb materials.
A. Glucose, K+ ions, Na+ ions, and HCO3- ions would be lost unnecessarily. B. The volume of the urine would increase dramatically. C. Glucose would lost unnecessarily. D. Nitrogenous wastes would accumulate dramatically in the blood. E. K+ ions, Na+ ions, and HCO3- ions would be lost unnecessarily.