Cladists feel that a cladogram is a hypothesis about the evolutionary history of a group. Using what you have learned about scientific hypotheses, support this view of a cladogram.
What will be an ideal response?
A cladogram is similar to a hypothesis in many ways. Both are based on observation or available data, and both are objectively tested. A hypothesis and a cladogram may be corroborated or rejected on the basis of additional data collected during testing. The reliability of accepting or rejecting hypotheses and cladograms is dependent on the knowledge and skill of the investigator.
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Fluid that collects in tissues is returned to the bloodstream by the
A. excretory system. B. digestive system. C. lymphatic system. D. vascular system. E. endocrine system.
Sulfur occurs in all living matter primarily as a component of proteins
Indicate whether this statement is TRUE or FALSE.
Chromatin condenses into chromosomes and the mitotic spindle begins to form during
a. interphase. b. prophase. c. metaphase. d. anaphase. e. telophase.
Cargo ships that entered the Great Lakes through canals in the St. Lawrence River inadvertently introduced zebra mussels. This species is not native to the Great Lakes and reproduces at a very high rate. Zebra mussels are filter feeders and are very efficient at filtering out phytoplankton and zooplankton. How would their introduction impact the organisms on the Great Lakes?
A) Biodiversity would increase because of the introduction of another species to the ecosystem. B) The native organisms would not be impacted at all. C) Their impact would be negligent because the lakes are so big and do not have other organisms that feed on the plankton. D) The native organisms that depended on the same food source would decrease in population, affecting the rest of the organisms in the food web.