Plasma is primarily composed of about 90% water, which serves as a solvent for various substances in the blood.

The cell wall of plant cells is primarily made of cellulose, which provides structural support.

The main component of the plant cell wall is cellulose.

The main component of urine is water, which makes up about 95% of its volume.

Plastic pollution in oceans leads to entanglement and ingestion by marine life, causing injury and death to various species.

The main differences between the kingdoms Fungi and Plantae include cell wall composition (chitin in fungi vs cellulose in plants) and mode of nutrition (heterotrophic in fungi vs autotrophic in plants).

The main disadvantage of asexual reproduction is the lack of genetic variation, which can make populations vulnerable to diseases.

Adaptive radiation occurs when a single ancestor species rapidly diversifies into a wide variety of forms to adapt to different environments, driven by environmental changes, genetic mutations, and isolation.

Transpiration pull, created by the evaporation of water from the leaves, is the main driving force for water movement in plants.

Transpiration pull, created by the evaporation of water from the leaf surface, is the main driving force for water movement in the xylem.

Deforestation leads to habitat loss, which is a major threat to biodiversity.

Deforestation leads to the loss of habitat for many species, resulting in decreased biodiversity.

Adenosine triphosphate (ATP) is the main energy source for muscle contraction.

Pepsin is the main enzyme that digests proteins in the acidic environment of the stomach.

Uric acid is the main excretory product of purine metabolism in humans.

Climate is the main factor that determines the type of ecosystem, influencing temperature and precipitation patterns.

Alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs, making them essential for respiration.

Antibodies are proteins produced by the immune system to identify and neutralize pathogens such as bacteria and viruses.

Cartilage provides support and flexibility to various structures in the body, such as joints and the rib cage.

Decomposers recycle nutrients by breaking down dead organic matter, returning essential nutrients to the soil.

Ligaments connect bone to bone, providing stability to joints.

Phloem is responsible for the transport of food (sugars) produced during photosynthesis from leaves to other parts of the plant.

Producers, such as plants, produce energy through photosynthesis, forming the base of the food chain.

Sepals protect the flower bud before it opens.

Skeletal muscle tissue is responsible for voluntary movements of the body, allowing for locomotion and manipulation.

Stratified squamous epithelium primarily functions in protection against abrasion and pathogens.

Surfactant reduces surface tension in the alveoli, preventing their collapse and making it easier for the lungs to expand during inhalation.

The cell wall provides protection and structural support to plant cells, maintaining their shape.

Gastric acid activates digestive enzymes, particularly pepsinogen to pepsin, and helps in protein digestion.

Gastric juice contains hydrochloric acid and pepsin, which are essential for the digestion of proteins.