Which component of a virus is injected into an infected cell? tail section nucleic acid protein capsid mitochondrion

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream

In which layer do organisms on earth love?

Which type of organism is a caterpillar