Why is variations beneficial to the species but not necessary to individuals

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Which type of bond forms between water moleculesstrong bondhydrogen bondcovalent bondpolar bond

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water.b. they use chlorophyll and oxygen to make carbon dioxide and water.c. they use sunlight, water, and carbon dioxide to make sugars.d. they use sunlight, water, and oxygen to make chlorophyll.