How do scientists use a phylogenetic tree?
a. To name and group species to construct an internationally shared classification system
b. To determine an organism’s taxonomic level
c. To show evolutionary pathways and relationships between organisms
d. To show the amount of time between evolutionary changes in related species
c. To show evolutionary pathways and relationships between organisms
Scientists use a phylogenetic tree to show evolutionary pathways and relationships between organisms.
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Charles Darwin observed an orchid flower with very long, thin tubes that prevent many species from feeding on the flower nectar and pollinating the flower. He offered a prediction that some species of pollinators would eventually be found that can feed and pollinate through the small tube. You decide to test Charles Darwin's proposal by placing nets over some orchids that allow small pollinators to enter, but prevent the large sphinx moth from entering. You then compare the number of seeds produced by plants with and without the nets. The seed production is
A. a hypothesis. B. a standardized variable. C. a theory. D. an independent variable. E. a dependent variable.
The letter "C" in the accompanying figure represents which teeth?
a. incisors b. molars c. canines d. premolars e. grinders
The first step in the healing of a fracture is the formation of ________
Fill in the blank(s) with correct word
Eyelash length is an inherited trait. In the human population, there is an eyelash length gene. There are two possible variants of this gene-an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less). The allele for long eyelashes is dominant (L) and the allele for short eyelashes is recessive (l). An individual who is heterozygous for eyelash length would have which of the following phenotypes?
A. Ll B. short eyelashes C. ll D. long eyelashes E. LL