Which of the following is an example of an allogenic change that drives succession?
A) seasonal changes in temperature, photoperiod, and light intensity
B) increased shading of seedlings by adult trees in a forest
C) increased nitrogen availability in soil due to the presence of leguminous plants
D) reduced salinity due to surface shading by grasses in a salt marsh
A
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Consider mumps. What is the causative agent? How is this disease spread? What happens in the body during the course of this disease? What type of immunity is conferred or used for this disease?
Why is the prevalence of mumps in developed countries generally low? What will be an ideal response?
Mitochondria are thought to have evolved from:
A. amoeba. B. heterotrophic protists. C. chloroplasts. D. cyanobacteria. E. proteobacteria.
In pea plants, Y confers yellow peas and y confers green peas. If you cross two heterozygous Yy pea plants, what fraction of the offspring will be yellow?
A. 50% B. 100% C. 25% F. 0% E. 75%
Adhesion proteins and ____ help guide the growth of the pollen tube in the proper direction towards the egg
a. differentiation upon contact with the flower b. exposure to moisture c. cell signaling pathways d. electromagnetic impulses from the flower e. insertion of the pollen tube