3) which of these statements best summarizes the cell theory?
a. cells are the building blocks of living things c. all cells contain a nucleus and other parts
b. cells can be seen through a microscope d. cells come in different shapes and sizes

A  Cells are the building blocks of living things

Explanation:

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.