All of the following are teratogens except _____
1. thalidomide
2. tetracycline
3. medical X-rays
4. Toxoplasma gondii
5. alcohol
considered teratogens
6
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CO2 and H2O are converted to HCO3
? and H+ in the blood of the lungs.
Indicate whether the statement is true or false.Sea stars and sea urchins operate their tube feet by
A. cilia transporting hemolymph from chamber to chamber. B. a water vascular system that regulates water pressure. C. sticky threads leading from the mouth and primitive brain. D. actin and myosin fibers that slide and give muscle actions to the five arms or "rays."
Which of the following breaks down the slowest during decomposition?
A) simple sugars B) cellulose C) chitin D) lignin
In some regions, butterflies are emerging earlier than the flowering of herbaceous plants. This is an issue because
A) butterflies rely on the flowers for food. B) butterflies rely on the flowers for shelter. C) butterflies rely on the flowers to deposit eggs. D) herbaceous plants rely on butterflies for food.