If the age-specific fertility rate is such that 100 females of age class x would produce 50 offspring, what is the contribution of age class x to the overall population growth rate?
A. 0.75
B. 0.5
C. 2
D. 50
E. cannot be calculated with this information.
E. cannot be calculated with this information.
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Phylogenetic trees are usually constructed using either a distance-based ________ approach, or a characteristic ________ approach.
Fill in the blank(s) with the appropriate word(s).
The skeletons of both hagfish and sharks are made of the same cartilaginous material
Indicate whether the statement is true or false
If a stem is cut, what will occur if the xylem sap is under tension?
A. Xylem sap will spurt out B. Xylem sap will stay at the cut surface C. Air will be pulled into the xylem D. The cut surface will form bubbles if placed under water
______ is a type of symbiosis in which both species benefit from the relationship.
a) mutualism b) parasitism c) commensalism d) predation