Which pair of hormones regulates the calcium levels of the blood?
a. thyroxin and parathyroid hormone
b. adrenocorticotropic hormone and thyroid stimulating hormone
c. prolactin and oxytocin
d. parathyroid hormone and calcitonin
e. calcitonin and thyroxin
d
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There is a giant sequoia (Sequoiadendron giganteum) named Washington (after George Washington) that was believed to be the second largest tree in the world (253.7 ft in height!) until it was struck by lightning in 2003
The lightning strike caused a fire at the top of the tree that reduced Washington's height to about 229 feet. The fire released carbon that was sequestered in wood into the environment in the form of __________. A. CO2 B. heat C. sugar D. ash E. air
Which term is given to the measure of the proportion of offspring that a particular phenotype will contribute to the next generation?
What will be an ideal response?
How are viruses classified by the ICTV?
a. By their DNA sequence b. By their number of rRNA c. By their structural components d. By their host range and other characteristics e. By the Linnaean binomial nomenclature system
Liquid water ________.
A) is less dense than ice B) has a specific heat lower than that of most other substances C) has a heat of vaporization higher than that of most other substances D) is nonpolar