Scientific knowledge cannot prove or disprove the existence, or importance to us, of issues that fall outside of the natural world
Indicate whether the statement is true or false
TRUE
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An intrauterine device works to prevent pregnancy by _____
a. changing the pH of the uterus so sperm cannot live b. changing the chemistry of the uterus so sperm cannot live c. interfering with sperm movement or implantation d. killing sperm e. preventing ovulation
Eukaryotic cilia and flagella arise from which of the following cellular components?
a. nucleus b. Golgi complex c. centrioles d. chromosomes e. nucleolus
When Bradshaw and colleagues investigated the quantitative trait loci (QTL) of two species of Mimulus (Mimulus cardinalis and Mimulus lewisii), they used marker loci as a way to map the QTLs. Their results are shown in the accompanying figure
According to these results, ________. A) the differences in genotype for the majority of these QTLs explained small amounts of the variations in flower phenotypes for both species B) some of the QTLs did have pronounced effects on the flowers' phenotypes C) at least one QTL explained 90% of the phenotypic variance for each species D) All of the above.
Water flow across the gills of fish that maximizes the efficiency of gas exchange is known as _____.
A. capillary movement B. countercurrent exchange C. deoxygenation D. pharyngeal movement E. osmosis