A fossil was found and determined by radiometric dating to be 11,400 years old. What is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?
A) 12.5%
B) 25%
C) 37.5%
D) 50%
B
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What technical advance allowed Walther Flemming and other scientists of his generation to better understand the stages of mitosis and meiosis?
A. the ability to obtain single cells B. the ability to slice cells thinly C. microscopes with two eyepieces D. microscopes with high-quality oil immersion lens E. electron microscopes
Which gland secretes a hormone that influences daily biorhythms?
1.hypothalamus 2.pineal gland 3.pituitary gland 4.thymus
The pertussis (whooping cough) vaccine has virtually eliminated whooping cough in the United States
Indicate whether the statement is true or false
The osculum of a sponge is entirely blocked by a fungal infection. Predict what will happen.
A. Choanocytes will no longer be able to function. B. Digestion will be prevented from occurring. C. The flow of water out of the sponge will decrease. D. Water will be unable to enter the sponge.