Top-down factors that can control the population sizes of plants or animals include which of the following factors? Select all that apply.
A. levels of primary producers in the ocean
B. nutrient-poor soil
C. healthy populations of secondary carnivores
D. the density of herbivores
E. the presence of a fungal pathogen
F. an extended period of drought
Answer: E
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Explain why individuals with cystic fibrosis have different levels of severity of the disease. What will be an ideal response?
A polymer coat consisting of a dense, well-defined polymer layer surrounding a cell is called a ___________
A) capsule.
B) glycocalyx.
C) lipopolysaccharide.
D) slime mold.
A mutant soybean plant that is unable to produce leghemoglobin will most likely suffer from ____
deficiency.
a. phosphorus b. magnesium c. potassium d. oxygen e. nitrogen
Which factor presents the greatest threat to biodiversity?
A) habitat loss or degradation B) introduction of nonnative species C) overharvesting D) pollution