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Almost 38,000 Iowa first grade students are slated to receive new books to take home as part of the state's ongoing literacy initiative. First grade students in public and accredited private ...
Large amounts of homework cause students' academic performance to worsen, even among older students. [8] Students who are assigned homework in middle and high school score somewhat better on standardized tests, but the students who have more than 90 minutes of homework a day in middle school or more than two hours in high school score worse. [10]
Plants have some of the largest genomes of all organisms. [74] The largest plant genome (in terms of gene number) is that of wheat (Triticum aestivum), predicted to encode ≈94,000 genes [75] and thus almost 5 times as many as the human genome. The first plant genome sequenced was that of Arabidopsis thaliana which encodes about 25,500 genes. [76]
Europeans first encountered cacti when they arrived in the New World late in the 15th century. Their first landfalls were in the West Indies, where relatively few cactus genera are found; one of the most common is the genus Melocactus. [65] Thus, melocacti were possibly among the first cacti seen by Europeans.
Botany, also called plant science or phytology, is the branch of natural science and biology studying plants, especially their anatomy, taxonomy, and ecology. [1] A botanist, plant scientist or phytologist is a scientist who specialises in this field.
The identification of plant fossils in Cambrian strata is an uncertain area in the evolutionary history of plants because of the small and soft-bodied nature of these plants. It is also difficult in a fossil of this age to distinguish among various similar appearing groups with simple branching patterns, and not all of these groups are plants.
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