Scienceis a body of knowledge; a collection of unified insights about nature, the evidence for which is an array of facts. Science can also be defined as a way of learning; a process of coming to understand the natural world through observation and the testing of hypotheses. A theoryis a general set of principles, supported by evidence that explains some aspect of nature. Science is a tentative, testable explanation that has not been proven true. The hypothesis may be tested through observation or through a series of experiments, as aided by statistical procedures. Evolution,which can be defined as the gradual modification of populations of living things over time. What must happen for mitosis to take place?The cell has to replicate its DNA Arthropods have a(n)exoskeleton_ that has allowed them to inhabit almost every environment on Earth Matter - Anything that has mass and occupies space Atoms- A basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons smallest part of an element that has all characteristics of that element. Atoms can link to one another in the process of chemical bonding. Molecule - The smallest part of a compound that has all characteristics of that element. A molecule is a compound of a defined number of atoms in a defined spatial relationship What are some of the functions of proteins?