A female rotifer (Brachionus calyciflorus) with two eggs. The eggs are the result of parthenogenesis, or asexual reproduction by the female, which occurs in rotifers when growing conditions are...
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In mammals, lactation has important effects on maternal and offspring fitness. Pinnipeds (fin-footed mammals) are a good mammalian group for research studies that focus on lactation because in...
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A periodical cicada (left) has mostly freed itself from its old exoskeleton (right). The cicada's new exoskeleton is light in color and has not yet hardened. Every 13 or 17 years, periodical cicadas...
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In this TIEE experiment, students investigate the costs of reproduction. In dioecious plants, a female's investment in reproduction is typically much greater than a male's, because while both sexes...
This laboratory exercise examines the changes in human demographic patterns by visiting a local cemetery, collecting data recorded on tombstones, and producing a graphical representation of...
In this TIEE dataset, students address the question of how changes in demographic vital rates influence the rate of population growth.
Students learn how projection matrices and elasticity...
Desert star (Monoptilon bellioides) flowers in bloom. Desert star is an annual plant that grows in very arid regions of the southwestern United States. Desert star and other desert annuals may delay...
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Two eggs are visible in this Hoopoe Lark (Alaemon alaudipes) nest. This lark species generally produces 2–3 chicks per brood. This lark lives in a desert environment, and compared to closely related...
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In this article we demonstrate the use of a primary research paper as an assessment tool, helping to determine how well students understand a biological concept and their ability to interpret...
This article illustrates how multiple methods can be used to assess student understanding of the “novel weapons hypothesis” presented in the Callaway and Ridenour review of theories regarding...
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