What are two reasons why the terrestrial planets formed closer to the sun after the supernova event that initiated the formation of the solar system? a.) they are made of denser objects, which can condense at relatively high temperatures. b.) they contain lightweight materials that condense in areas of relatively low radiation. c.) they are made of heavier elements, which have a stronger gravitational attraction to the sun. d.) they are relatively small in size, so the sun’s gravity has a strong influence on them. e.) they have gaseous surfaces, which is ideal in those areas of high radiation near the sun.

Air pollution is only caused by human activity, select the best answer from the choices provided ot of true or false

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.