What causes a drop in female hormone levels? A: The onset of the menstrual flow. B: If an egg is released from the ovary. C: if the uterine wall thickens. D: if the egg is not fertilized.

You notice that extended use of the microscope is giving you a headache. Your professor mentions that the headaches may be due to staring into light that is too bright for extended periods of time.

Plant species A has a diploid number of 12. Plant species B has a diploid number of 16. A new species, C, arises as an allopolyploid from A and B. The diploid number for species C would probably be A) 12. B) 14. C) 16. D) 28. E) 56.

The expectation is a prediction of what will happen when an idea is tested with O evidence O reasoning O observations O rebuttals

Which of the following is not an example of a service provided by beneficial bacteria

How would someone measure the effect of pH on the rate ofenzyme reaction?

Soil formation is most influenced by__. Wind speed. Cloud cover. Air pressure. Rain fall.

What is the basic cause of ocean tides? A. Gravitational attraction between the Moon and the entire solar system B. Gravitational force of atmospheric pressure C. Gravitational force of volcanic activity D.

Which type of chromosomal mutation causes this form of Down syndrome?

Chlorine is added to kill remaining microorganisms in the water. true or false.

Sensation is the process by which our sensory receptors and nervous system take in stimulus energies from the environment;