In science the word "theory"
a. signifies that a hypothesis has been tested and proven over a period of time.
b. means that a scientist has a hunch something is true.
c. has essentially the same meaning as "hypothesis."
d. carries a considerable amount of doubt as to its validity.
e. is an explanation that has been published.
A
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The passive movement of a solute from a point of high concentration to a point of low concentration is known as:
A. diffusion. B. active transport. C. endocytosis. D. solubility.
Which of the following is an ultimate question in regards to animal behavior?
A. Why do parents risk their lives for those of their offspring? B. How do crows know to work together to attack a great horned owl? C. How does a male songbird learn the songs that attract females of his species? D. How does the nervous system translate instinct into action? E. When does a human male develop a deep voice?
Grana, thylakoids, and stroma are all components found in
a. vacuoles. b. chloroplasts. c. mitochondria. d. lysosomes. e. nuclei.
A group of ants escaped from a picnic basket carried to the top of a mountain and thrived in this area where there were no other ants. Many years later descendants of these ants crawled into a picnic basket on the mountain and traveled back to the valley
from which their ancestors had come. Which of these observations would cause you to conclude that the ants on top of the mountain had become a different species from those in the valley? A) The mountain ants and valley ants were different colors. B) The mountain ants and valley ants were different sizes. C) The mountain ants ate different food than the valley ants. D) The mountain ants could not mate with the valley ants.