Aphoton has 3.4 × 10–18 joules of energy. planck’s constant is 6.63 × 10–34 j•s. what is the frequency of the photon? 5.12 × 10–15 hz 1.95 × 1016 hz 5.12 × 1015 hz 1.95 × 10–16 hz

What protects the lining of the stomach from acidic gastric juices?

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.