Mammals breathe with the help of a diaphragm, and belly breathing uses the diaphragm, which helps relax the lungs. Given these facts, what breathes by relaxing the lungs among the following options: - mammals - tortoises - dogs - chickens - ducks - humans - crocodiles - animals
mammals

Population density is the average number of individuals per unit of area or volume, and density is the population divided by the area. Given these facts, what is the average number of individuals per unit of area or volume among the following options: - population divided by class - population divided by area - solid, liquid, gas - biological diversity - competing for resources - population divided by income - population divided by wealth - Something that makes plants green
population divided by area

Antibodies are large, Y-shaped proteins that recognize and bind to antigens, and antibody production is triggered by antigens. Given these facts, antigens produce large, Y-shaped what among the following options: - Allergies - epidermal - deltas - bioaerosols - Joules - parasites - proteins - PDAs
proteins