diagnostic test science (all solved)

The gravitational force from the sun extends: - to infinity - only to the edge of the milky way galaxy - only to the edge of the solar system - only to the core of the earth correct answers to infinity The gravitational force from any object extends to infinity. The strength of the force decreases with distance, but the force never decreases to zero. This means every object in the Universe is pulled by every other object in the Universe. which of the following is true about the carbon cycle? - bacteria remove carbon from the atmosphere while decaying organisms - carbon may be released into the atmosphere through photosynthsis - carbon may become part of sedimentary rock and enter the rock cycle - carbon may become compressed under the weight of many layers of the earth, rendering it useless to humans correct answers carbon may become part of sedimentary rock and enter the rock cycle Sea otters eat sea urchins. This keeps the number of sea urchins in check and protects kelp forests, which are vital to their ecosystem. Which of the following best describes the most important role of the sea otter? - limiting factor - keystone species - ecosystem engineer - apex predator correct answers keystone species sea otters are keystone species due to the large influence they have on these ecosystems definition- species in an ecosystem largely depends on In humans, the allele for freckles (F) is dominant over the allele for no freckles (f). which of the following is a genotype of people w/out freckles? - Ff - ffff - ff - FF correct answers ff both alleles must be recessive if a person is to exhibit a recessive trait such as lack of freckles the volcanic eruption of mt. st. helends in 1980 deposited a large amount of ash in the local atmosphere. which of the following changes to the earth's system was reflected in the aftermath of the explosion? - increased solar reflection that resulted in lower temperatures in the affected areas