A cell must expend energy to produce a concentration gradient
__________________ Indicate whether the statement is true or false.
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Paleobotanists often examine fossils of extinct plants and their seeds to determine the dominant biome of the area at the time when the fossil was formed. You were examining a seed that showed signs of being from grasses well-adapted to long periods without rain. The strata in which it was found showed no trees but many grasses and other plants with hard, drought-resistant seeds. Given what you know about the biomes, in which of the following would you expect to find this plant?
a. tropical wet forest b. arctic tundra c. savanna d. boreal forest
What percentage of body weight is fluid in healthy adult males and females?
1.30% for both males and females 2.40% for males, 20% for females 3.60% for males, 50% for females 4.65% for males, 30% for females
________ traits involve the expression of certain autosomal genes that are not located on the sex chromosomes but that are powerfully influenced by the presence of sex hormones, so that the expression of these genes differs between males and females
Fill in the blank(s) with correct word
A ring of vascular bundles in a stem is characteristic of:
A) monocots. B) non-flowering seed plants. C) many dicots. D) both monocots and dicots.