Question

1. the \building blocks\ of living things are *

proteins endoplasmic reticulum
size life processes
chlorophyll nucleus
cells chloroplasts
your answer

Explanation:

In biology (a subfield of Natural Science), cells are known as the basic structural and functional units (building blocks) of all living organisms. Proteins are macromolecules, organelles like endoplasmic reticulum/nucleus/chloroplasts are parts of cells, size is a physical property, life processes are activities of living things, and chlorophyll is a pigment. So the correct answer is cells.

Answer:

cells