BCG vaccine is used to prevent: MCQ with Answer and Explanation

Explanation:
Ethology is the branch of biology that deals with the scientific and objective study of animal behavior, usually with a focus on behavior under natural conditions. Ecology studies ecosystems, Entomology studies insects, and Eugenics deals with the improvement of human genetic traits.

Explanation:
COVID-19 is caused by SARS-CoV-2, a novel coronavirus. Tuberculosis is bacterial (Mycobacterium). Influenza is caused by influenza viruses (Orthomyxoviridae), not coronavirus. Pneumonia can be bacterial or viral, but the question specifies Streptococcus which is bacterial. COVID-19 emerged in 2019, causing a global pandemic, primarily affecting the respiratory system.

Explanation:
All chordates, at some point during their larval or adult stages, possess three key features: a dorsal hollow nerve cord, a notochord (a flexible rod supporting the body), and pharyngeal slits. The notochord may be replaced by a vertebral column in vertebrates. Arthropods have a ventral nerve cord and open circulatory system.