D. Fossil in layer 6 are less than 540 million years old
Active Transport. In contrast to passive transport that does not require energy to transport substances across the plasma membrane, active transport requires energy to maintains the balance of transporting molecules across the cell membrane.
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PRECAMBRIAN TIME COVERS the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms almost four billion years later.
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Basic Categories of Arthropods
Chelicerata: horseshoe crabs, spiders, scorpions, sea spiders and mites.
Myriapoda: millipedes, centipedes, pauropods and symphylans (known as glasshouse symphylans or garden centipedes)
Crustacea: brine shrimp, barnacles, lobsters, crabs, shrimp and remipedes.
Explanation:
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Answer:
The movement of ions or molecules across a cell membrane into a region of higher concentration