Have adapted to antibiotics

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.