Populations have three basic types of dispersal patterns-clumped, random, and uniform. What situation supports random distributions?
A. When individuals of the populations do not interact strongly with one another
B. When there is an even distribution of resources
C. When individuals of the population display social interactions
D. When individuals of the population are in competition for resources
Answer: A
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Choose the true statements about the evolution of eyes in mice and fruit flies.
_____ The gene Pax6 codes for a transcription factor involved in lens formation in the mouse. _____ In the fruit fly, the gene eyeless codes for a transcription factor involved in lens formation. _____ When the mouse gene Pax6 is inserted into a fruit fly, it causes a vertebrate-type lens to form on the fly's leg. _____ The sequences of the genes eyeless and Pax6 are very different.
Resident biota of the gastrointestinal tract include ________.
A. Bacteroides B. Streptococcus C. Lactobacillus D. Haemophilus E. All of the choices are correct.
Which of the following is NOT found in the
epidermis? a. stratified epithelium b. blood vessels c. adhering cell junctions d. keratin e. melanin
Primary growth in roots originates from ____.
A. dermal cells B. vascular cells C. apical meristems D. lateral meristems E. the pericycle