Over the winter your hibiscus plants were killed by cold winter temperatures. You are so annoyed that you ignore the garden; much to your surprise sunflowers sprout on their own
That second summer you see lots of goldfinches (small yellow birds) visit the garden to eat
the sunflower seeds.
Given that all abiotic conditions remained the same over the two years, why do you see
hummingbirds the first year and goldfinches the second year?
A. Communities depend on interactions
among organisms.
B. Communities depend on the physical
environment.
C. Disturbance can modify community
composition.
D. All of the responses are correct.
E. More than one of the responses are
correct.
A
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pH is
a. a measure of phosphorous concentration. b. a measure of hydrogen ion concentration. c. measured by counting the number of different kinds of aquatic insects. d. measured on a scale from 1 to 100
Addition of salts preserves foods because they
A. lower pH. B. increase osmotic pressure. C. create an isotonic environment. D. lower osmotic pressure.
Which organelle synthesizes phospholipids, fats, and steroids?
a) Chloroplast b) Rough endoplasmic reticulum c) Smooth endoplasmic reticulum d) Golgi complex
Where does the energy for the Calvin cycle come from?
A. carbon dioxide B. O2 C. NADPH and ATP D. sugar