Which muscles are strengthened the most by swimming? a.) the muscles of the abdomen b.) the muscles of the legs c.) calf muscles d.) shoulder muscles

The correct answer is D

Muscle groups engaged by Breaststroke

Pectoral and Latissimus dorsi muscles are used to sweep the arms inwards against the water.

Glutes and Quadriceps muscles power the breaststroke kick.

oxygen +1 most likely

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.