Photosynthesis is a process that A green plants use to produce food. B animals use to breathe. C predators use to catch their prey. D illustrates symbiosis.

How to convert a density of 0.791g/cm3 to lb/ft3

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.