Answer :Four characteristics were to be used for the classification of all viruses:
Nature of the nucleic acid in the virion.
Symmetry of the protein shell.
Presence or absence of a lipid membrane.
Dimensions of the virion and capsid.
Explanation:
Answer:
The major blood vessels connected to your heart are the aorta, the superior vena cava, the inferior vena cava, the pulmonary artery (<em>which takes oxygen-poor blood from the heart to the lungs where it is oxygenated),</em> the pulmonary veins (which bring oxygen-rich blood from the lungs to the heart), and the coronary
Bright sunlight, lack of competitors, and more carbon dioxide
The white blood cell identifies the toxin produced by the pathogen and creates antibodies to fight the pathogen