Which of the following concepts explains why the wings of a chicken and a robin are different?

a. homologous structure
b. analogous structure
c. modern synthesis
d. microevolution


a. homologous structure

Biology & Microbiology

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Parazoa  

A.  are pseudocoelomates. B.  exhibit bilateral symmetry. C.  include Cnidaria and Ctenophora. D.  exhibit primitive segmentation. E.  have no true tissues.

Biology & Microbiology

Much of our understanding of how large organisms respond to environmental variation is based on

using model species.

Indicate whether the statement is true or false.

Biology & Microbiology

Confronting danger will cause this part of the autonomic nervous system to become active. _____ 2) This is a group of brain structures that helps us to experience feelings such as joy, fear, and anger. ______ 3) This filters sensory input. _____ 4) Tissue located within the brain that allows the left and right cerebral hemispheres to communicate with one another. _____ 5) A tumor here may cause you to eat either too much or too little. _____

A) Autonomic nervous system B) Pons C) Reticular activating system D) Hypothalamus E) Limbic system F) Corpus callosum G) Parasympathetic nervous system H) Sympathetic nervous system I) Thalamus J) Somatic nervous system

Biology & Microbiology

The process in which the intercostal muscles contract, pulling the rib cage upward and outward and causing the lungs to inflate, is called ________

A) inspiration B) expiration C) exhalation D) deflation

Biology & Microbiology