Which of the following is not a clade, a group including an ancestral species and all of its descendants?
a. Fish
b. Tetrapods
c. Amphibians
d. Reptiles
e. Lobe-fins
Answer: a. Fish
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After mutations begin a cancer, other factors that influence whether the disease proceeds include
A) how old a person is and whether he or she smokes. B) whether a person has had cancer before and its location in the body. C) location of the cancerous cell in the tissue and how specialized the cell is. D) whether or not a person's relatives have cancer.
When house plants grow toward a window they demonstrate the ability of living organisms to respond to their environment
a. true b. false
As soon as a population achieves the replacement fertility rate of 2.1, the population will stop growing
Indicate whether the statement is true or false
Agricultural companies have developed the ability to control the genetic characteristics of their crops. Genetic engineering techniques have been used to produce all of the following effects except
A. grow salt-tolerant crop plants B. decrease harvesting time C. make crop plants resistant to disease D. decrease soil nitrogen levels