A A _____ is a working explan- ^ation for a scientific ^problem: A) Hypothesis B) Con-^clusion ^B Using a(n) ______ microscope, ^the details of a virus could ^be observed. ^A) Compound B) Electron ^A The process by which a species^becomes better able to sur- ^vive is called: ^A) Adaptation B) Variation ^B _____ is the principle stating^that life can only come from ^life. ^A) Abiogenesis B) Biogenesis ^B Organisms which make their ^own food are called: ^A) Heterotrophs B) Autotrophs ^ ^A What is the one variable ^factor in an experiment ^called? ^A) Experimental B) Control ^B The ability of an organism ^to respond to conditions ^outside itself is called: ^A) Stimulus B) Irritability ^A The 17th c. scientist, _____, ^first disproved the theory of ^Spontaneous Generation. ^A) Spallanzani B) Redi ^B Which of the following is ^not a heterotroph? ^A) Snail B) Grass ^ ^B The building of organic ^molecules by living organisms ^is called: ^A) Biogenesis B) Biosynthesis ^
