Which of the following defines the competitive exclusion principle?
a. Different species cannot co-exist when competing for the same resources.
b. Symbiotic relationships between species take time to develop.
c. Mutualism ensures that different species benefit from interacting.
d. Only the foundation species in a habitat will survive with limited resources.
a. Different species cannot co-exist when competing for the same resources.
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Which base pairs with adenine in a DNA molecule?
a. adenosine b. cytosine c. thymine d. guanine e. uracil
Carbon dioxide levels in the blood and cerebrospinal fluid affect pH. This enables the organism to sense a disturbance in gas levels as _____
A) the brain directly measures and monitors oxygen levels and causes breathing changes accordingly B) the medulla oblongata, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing C) the brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide D) stretch receptors in the lungs cause the medulla oblongata to speed up or slow breathing
During primary growth:
A. A plant’s roots and shoots thicken and become woody. B. A plant’s roots and shoots lengthen, and it produces soft parts such as leaves. C. Two lateral meristems form in older stems and roots. D. When cells of vascular cambium divide, some of them differentiate. E. In eudicots and gymnosperms, the thickening originates at lateral meristems.
Most of the creamy flesh of a corn kernel is ____ tissue
a. pollen b. endosperm c. ovary d. carpel e. ovulec