<span>It is determined that a bird can be classified into several species, this is a particular species of birds that stands out among others for their different colors of feathers, this is for the genetic and biological variation of each living being and its bird, Area and by its morphology.</span>
Answer:
4
Explanation:
Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.
B. Endocrine system. It is a collection of glands which produce hormones.