Social behavior occurs in groups, but not all groups display social behavior. Groups that display social behavior often have
A. some individuals doing one job and others in the group doing different jobs.
B. long periods of contact between parents and offspring.
C. elaborate methods of communicating among individuals in the group.
D. All of these answers are true.
D. All of these answers are true.
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Mitosis is a process that is unique to humans
a. True b. False Indicate whether the statement is true or false
What kind of bonds link amino acids to form the basic sequence of a protein?
a. disulfide b. hydrogen c. ionic d. peptide e. noncovalent
Mature vessel elements:a
form sieve tubes in the vascular tissue. b. have pits in their side walls, which allow water to be transported laterally. c. are alive and contain cytoplasm. d. are given support by companion cells. e. occur in pairs, forming stomata in the epidermis
Which sentence best describes the difference between plant cell division and animal cell division?
a. In animal cells, but not plant cells, cytokinesis is accomplished by formation of a cleavage furrow. b. In animal cells, replication of chromosomes occurs during interphase, while in plant cells replication occurs when the nuclear envelope disintegrates. c. In plant cells, centrosomes have an important role in spindle formation, while in animal cells centrosomes do not function during cell division. d. In plant cells, but not animal cells, cytokinesis is accomplished by formation of a cleavage furrow.