In which part of the human respiratory system does actual oxygen exchange take place? 1.bronchi 2.trachea 3.diaphragm 4.alveoli

Draw the structure of dna nucleotide with adenine as nitrogenous base

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2

The bacteria in the human gut feeds on the food we eat and us break it down for better digestion. what does this exemplify? (a) predator-prey cycle (b) parasitism (c) mutualism (d) a disrupted food chain