The element that is a central component of the chlorophyll molecule is: MCQ with Answer and Explanation

Explanation:
The biceps brachii is a two-headed muscle located in the upper arm, responsible for flexing the elbow. The quadriceps femoris is a large, four-headed muscle group in the front of the thigh, extending the knee. The diaphragm is a dome-shaped skeletal muscle that forms the floor of the thoracic cavity and the roof of the abdominal cavity, crucial for breathing. All statements are correct.

Explanation:
Cotyledons are seed leaves that store food (starch, proteins, lipids) for the developing embryo and may become photosynthetic after germination. Monocots have one, dicots two. Radicle is root, plumule shoot, seed coat protects.

Explanation:
Porifera (sponges) are characterized by the presence of a complex water canal system (canal system) used for food gathering, respiratory exchange, and waste removal. Water enters through numerous small pores called ostia and exits through a large opening called the osculum. They are mostly marine and asymmetrical.