Where a branching point in a phylogenetic tree is called a _______ ; it illustrates that _______ has occurred.
A. break; death of a species.
B. clade; birth of a species.
C. node; cladogenesis.
D. node; anagenesis.
E. break; anagenesis.
C. node; cladogenesis.
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________ are toxic proteins released from the pathogen as it grows
A) Endotoxins B) Exotoxins C) Macrotoxins D) Microtoxins
The accepted explanation for the disappearance of the dinosaurs is _____
a. the result of an asteroid impact b. the loss of food sources c. competition by mammals d. gas emissions from volcanoes e. giant tsunamis caused by earthquakes
You discovered an unidentified weed and cut it almost to the ground with the lawn mower. Soon it grows as tall as it was before you cut it. This growth is likely due to which growth region?
A) Shoot apical meristem B) Root apical meristem C) Vascular cambium D) Lateral bud meristem E) Cork cambium
A population of fruit flies is maintained at 4,000 individuals for t generations. During the 11th generation, the professor in charge of the flies forgot to by fly food and only 100 flies survived. What is the effective population size of this population?
What will be an ideal response?