If extinction is a normal part of ecosystems, and mass extinctions have happened before, why should humans be concerned about the rising extinction rate? What do current extinctions tell us about our impact on modern environments?

Hey can you me with this i really need y’all

One nanometer is equal to how many meters?

what is your question? collegechemistry 5+3 pts in november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.