Which statement is true about human population growth? The population was 200 million people for most of history. In 1800, there were one billion people on Earth. The human population doubled between the years 1900 and 1950. World population has experienced continuous growth since 8000 BC. ✔✔In 1800, there were one billion people on Earth. Select the item below that is abiotic. Fungi Rainfall Trees Algae ✔✔Rainfall "Threats of an epidemic haunt citizens as the number of unvaccinated children continue to grow. People are frightened of the implications and angry that a few have placed so many at risk." Choose the most likely source for this quotation. A politician, because the statements are general and may be biased The media, because the language is controversial and sensationalistic A scientist, because the language is non-technical so that others will understand A scientific journal, because it has been peer-reviewed and verified ✔✔The media, because the language is controversial and sensationalistic Which of the following is the best example of how a nonprofit organization can apply environmental science? Vote for a political candidate who supports environmental issues Promote sanitation and clean drinking water in developing nations Reintroduce an endangered species into a national park Use data to formulate climate change predictions ✔✔Promote sanitation and clean drinking water in developing nations Which of the following is true about continental drift? The movement of tectonic plates is caused by earthquakes and volcanoes. Tectonic plates float on the molten core and are constantly in motion. Biodiversity is improved by the joining of continents, which decreases the amount of shoreline. Throughout the planet's history, tectonic plates have remained in generally the same positions. ✔✔Tectonic plates float on the molten core and are constantly in motion. The Green Revolution contributed to a population explosion due to research and technology breakthroughs in the mid-1900s. Select one statement that is NOT a result of these breakthroughs. Fertilizers were chemically produced, which improved food supplies. Improvements to agricultural crops increased production worldwide. Advances were made in sanitation and medicine that improved lives. All nations became stronger and more self-sufficient as the population increased. ✔✔All nations became stronger and more self-sufficient as the population increased. The atmosphere on early Earth (4.5 to 3.8 billion years ago) __________. was formed by lightning energy and UV radiation allowed for the chemical processes that led to early life created unfavorable conditions for forming chemical bonds consisted of a combination of gases, including oxygen ✔✔allowed for the chemical processes that led to early life Ecosystems provide many benefits to humans, which are termed "ecosystem services." Using natural resources for food and fuel is an example of the __________ services that ecosystems are capable of providing. cultural provisioning regulating supporting ✔✔provisioning "Let's use the scientific method to solve this," said John. His roommate Dean stared. "Huh?" "Look. We plug in the blender to make our smoothies, but it won't turn on, right? So we ask ourselves why. We see that other electrical things are working in the apartment, so we know it isn't a problem with the electricity."