During inhalation, the diaphragm
A) relaxes and flattens. B) contracts and flattens.
C) relaxes and becomes dome-shaped. D) contracts and becomes dome-shaped.
B
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In acidic soils or in habitats subjected to prolonged acid rain, what element is often released from rocks that is toxic to many plants?
A. iron B. chlorine C. molybdenum D. selenium E. aluminum
Which of the following describes osmosis?
a. The transport of water across a membrane b. The transport of material with high molecular weight c. The transport of water from low to high concentration areas d. The transport of substances inside the plasma membrane
What best describes index fossils?
a. Organisms that existed over a limited period b. Organisms whose age is hard to detect c. Fossils that are used in radioactive dating d. Fossils of the most ancient organisms
Who is credited with first observing cells?
A) Robert Hooke B) Anton van Leeuwenhoek C) Robert Koch D) Louis Pasteur E) Carolus Linnaeus