Symptoms of menstrual pain are caused by
a. prostaglandins causing smooth muscle
contraction and release during the period.
b. the hormone aldosterone causing more
absorption of sodium.
c. lack of exercise causing hormonal changes.
d. lack of sunlight limiting hormone production.
e. all of these.
Answer: a
You might also like to view...
One of the considerations scientists have when breeding for certain characteristics in cultivated crops such as rice or corn is to look for:
A. wild type genes B. plant adaptations to certain environmental conditions C. plants that generally grow where other plants cannot grow D. plants that are stressed E. plants that have good characters for leaf adaptations
What is the leading hypothesis for what might have brought about the extinction of the dinosaurs?
A) A new disease B) Competition from mammals C) An asteroid impact D) Massive volcano eruptions
The typical prokaryotic flagellum features
a) a complex "motor" embedded in the cell wall and plasma membrane. b) an internal 9 + 2 pattern of microtubules. c) a basal body that is similar in structure to the cell's centrioles. d) an external covering provided by the plasma membrane.
Which of the following ecosystem services is considered indirect and dependent more on maintenance of intact ecosystems and less on availability of particular species?
A) production of food B) production of fiber C) production of medicines D) production of clean air and water E) all of the above