Explanation

 Prostaglandins in semen facilitate the transport of sperm.

Explanation

Planaria has a diffused nervous system.

Planarians, which are flatworms belonging to the genus Planaria, have a primitive nervous system known as a diffused nerve net.

This nerve net is spread throughout the body and lacks the centralized organization found in more complex nervous systems.

Despite its simplicity, this nervous system allows planarians to exhibit basic behaviors such as:

• movement
• feeding
• response to stimuli
• 
  

Explanation

• Blood vessels, which include arteries, veins, and capillaries.
• It form a network that carries blood throughout the body.
• It supplying oxygen and nutrients to tissues and organs.

Explanation

"hypertension" is often referred to as the iceberg disease.

This is because hypertension often has no obvious symptoms in its early stages, earning it the nickname "the silent killer.

"Iceberg disease" is a term used to describe conditions where only a small portion of the problem is visible or apparent

Explanation

ATP is a nucleotide consisting of an adenine base attached to a ribose sugar, which is attached to three phosphate groups.

These three phosphate groups are linked to one another by two high-energy bonds called phosphoanhydride bonds.

Explanation

Pistia stratiotes is the botanical name of water lettuce.

It is an aquatic plant known for its floating rosette of leaves.

Explanation

Explanation

The human cerebral cortex is disproportionately large.

It accounting for more than 80% of total brain mass.

It enabling advanced cognitive functions. 

This extensive development facilitates complex reasoning, language, and problem-solving abilities unique to humans.

Explanation

The idea of inheritance of acquired characteristics was presented by Jean Baptist Lamarck.

He proposed that traits acquired during an organism's lifetime could be passed on to its offspring, a concept that has since been largely discredited in modern genetics.

Explanation

Rheumatoid arthritis is an example of an autoimmune disorder.

In this condition, the immune system mistakenly attacks the joints.

It leading to inflammation, pain, and potential joint damage.