In Klinefelter syndrome males have chromosomes XXY. This is an example of:

a. Non-disjunction of sex chromosomes

b. Crossing over

c, Chromosomal rearrangement

Paleontologist Stephen Jay Gould has stated that "mankind stood up first and got smart later." What evidence supports that statement?

Which of these describes something that would increase the validity of an experiment?

Based on the graph, at what span of time was the birthrate higher than the death rate? A. From year 5 to year 7 B. From year 6 to year 10 c. From year 1 to year 6 D. From year 6 to year 8

The central portion of a neuron where most of the metabolic work is performed is called the axon. nucleus. mitochondria. cell body. dendrite.

If the only organisms on earth that perform photosynthesis were bacteria with only one photosystem, which perform cyclic photophosphorylation, would the resulting environment be capable of supporting animal life as we know it?

Which best explains how the body maintains homeostais? A. All systems work together to match the external environment B. All systems work together to stabilize the body C. Each system works interdependently to stabilize the body D.

It is an effect that drug use can have on society? A. Drug use increases pollution. B. Drug use leads to an increase in criminal activity. C. Drug use increases the spread of disease. D. All of the above

Which of the following affects the speed of light waves in a material? Angle at which the ray strikes the medium Color of the material Density of the material Temperature of the light wave

What does the nosepiece do on a microscope

What does a scale measure