The adjustment of the shape of the lens by the ciliary muscle is:
a. visual accommodation
b. refraction
c. reflection
d. photoreception
e. perception
a
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Why are waterlogged soils often infertile?
A. Nitrifying bacteria require oxygen, and the excess water takes the place of oxygen-containing air. B. Water molecules are used instead of oxygen for cellular respiration. C. There is less carbon in waterlogged soil than dry soil. D. The lack of physical space in this type of soil blocks bacterial growth.
Select the correct sequence for the pathway of blood through the heart.
A. Body ? Left atrium ? Left ventricle ? Lungs ? Right atrium ? Right ventricle ? Body B. Body ? Right ventricle ? Right atrium ? Lungs ? Left ventricle ? Left atrium ? Body C. Body ? Left ventricle ? Left atrium ? Lungs ? Right ventricle ? Right atrium ? Body D. Body ? Right atrium ? Right ventricle ? Lungs ? Left atrium ? Left ventricle ? Body
A small wooded area was cleared for a new building, but then the builders went bankrupt. Over the ensuing years, plants and animals moved back into the plot in a process called ________
A) climax community B) biological magnification C) secondary succession D) primary succession
________ is often referred to as the "stress" hormone since it initiates and maintains seed and bud dormancy.
A. Gibberellins B. Abscisic acid C. Cytokinins D. Ethylene