Which statement is correct about rough ER and smooth ER? 1) Rough ER contains ribosomes, and smooth ER transports materials other than proteins. 2) Rough ER transports materials other than proteins, and smooth ER contains ribosomes. 3) Rough ER transports proteins, and smooth ER contains ribosomes. 4) Rough ER contains ribosomes, and smooth ER transports proteins.

Which of the following is a difference between a food chain and a food web? selected: a. food webs contain both plants and animals. food chains only contain animals.this answer is incorrect. b. food webs show energy transfer. food chains show which animal eats which animal. c. food webs separate organisms by tropic level. food chains do not. d. food webs are a complex patterns of energy flow. food chains only show one line of energy flow.

Which is not a type of symmetry? a. asymmetryb. radial symmetryc. bilateral symmetryd. lateral symmetry

Pulmonary arteries carry highly oxygenated blood. true or false?