In a forest, most of the flying animals such as hummingbirds, owls, etc. can be found in the upper canopy.

 The correct option is 4.

The thymus gland is a pink-grey organ that lies underneath the top of the breast bone. In animals it is known as the sweetbreads. The role of the thymus gland is to process lymphocytes, which are white blood cells that travel the body through the bloodstream.

The offsprings get DNA from both mother and father. Hence, their traits are influenced by both the parents.

The dorsal chamber of the haemocoel is the pericardial sinus which is connected to the heart and gives oxygenated blood.  

A lipase is an enzyme that catalyses the hydrolysis of fats (lipids). Lipases are a subclass of the esterases. Lipases perform essential roles in the digestion, transport and processing of dietary lipids (e.g. triglycerides, fats, oils) in most, if not all, living organisms.

 World Biodiversity Day is observed on December 29.

Ligaments and tendons are a part of the musculoskeletal system, with ligaments attaching bones to bones and tendons muscles to bones. They both are connective tissue.

Kinesin are plus end directed microtubule protein that uses a microtubule track along which it tends to walk. They are vital to movement of chromosomes during mitosis and are also responsible for shuttling membrane bound organelles (mitochondria, Golgi bodies, and vesicles within eukaryotic cells. 

Biosystematics is the study of diversity of organism and all their comparative and evolutionary relationships.