True, maria are dark, smooth, <em>flat </em>surfaces on the moon.
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Answer:
1.Plasma membrane is a semi permiable layer present in a plant cell.it allows only selected substances to pass in and out of the cell.
Answer:
Nucleotide, Gene, DNA, Chromosome, Nucleus, Cell, Organism!
Explanation:
Nucleotides are building blocks of DNA and are the smallest among the given options. DNA is larger than genes but smaller than chromosomes as DNA fits within a chromosome. Chromosomes are present within the nucleus. Nucleus along with cytoplasm and various cell organelles builds a cell. Many cells are specifically arranged to form an organism.
Continental drift was a theory that explained how continents shift position on Earth's surface.
Wegener believed that all the continents were once joined together in an "Urkontinent" before breaking up and drifting to their current positions. Many scientists disbelieved his theory, however, it did introduce the idea of moving continents to geoscience. Hence, it was determined decades later, due to his findings of rocks and fossils that spread throughout the continents, the past existence of a supercontinent had at one point joined all the world's landmasses as one. Pangaea was a supercontinent that formed roughly 200 to 250 million years ago, according to the U.S. Geological Survey (USGS) and was responsible for the fossil and rock clues that led Wegener to his theory.
Wegener knew that fossil plants and animals such as mesosaurs, a freshwater reptiles that were found only South America and Africa during the Permian period, could be found on many continents. He also matched up rocks on either side of the Atlantic Ocean like puzzle pieces. For example, the Appalachian Mountains (United States) and Caledonian Mountains (Scotland) fit together, as do the Karroo strata in South Africa and Santa Catarina rocks in Brazil.
