The Carboniferous period included
A. the development of large coal beds.
B. flying insects with wing spans up to 75 centimeters.
C. ferns and early plants that grew up to 40 meters in height.
D. All of the answer choices are correct.
E. sediment-dwelling invertebrates.
D. All of the answer choices are correct.
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Which of the following does NOT apply to
parasitoids? a. They are insects b. They kill animals on which they feed c. The host usually survives d. The larvae develop in host body e. Some are effective biological control agents
What types of plants are in the class known as monocots and the family Poaceae?
A) peas
B) grasses
C) palm trees
D) maple trees
After one conducts a critical experiment, what is the next step in the scientific process?
A) Make observations. B) Formulate a hypothesis. C) Draw conclusions, and make revisions. D) Devise a testable prediction. E) Formulate a null hypothesis.
Which of the following elements is essential for ALL bacterial cells but is considered a micronutrient required at relatively low levels?
a. calcium b. phosphorus c. nitrogen d. selenium