Evolution is the term used to describe the process by which species change over time through genetic variation and natural selection.

Fertilization is the process where sperm and egg cells fuse to form a zygote.

Fertilization is the process where sperm and egg unite to form a zygote.

Inhalation is the process of taking air into the lungs, while exhalation is the process of breathing out.

Exhalation is the process of breathing out, where carbon dioxide is expelled from the lungs.

Fertilization is the process where a sperm cell merges with an egg cell to form a zygote.

Ovulation is the process of releasing an egg from the ovary, typically occurring once a month.

Tidal volume is the amount of air that is inhaled or exhaled during a normal breath.

Residual volume is the amount of air that remains in the lungs after a person exhales as much as possible.

Cardiac output is the volume of blood pumped by the heart in one minute, calculated as stroke volume times heart rate.

The total lung capacity of an average adult human is approximately 4-6 liters.

As of now, there are approximately 30 recognized animal phyla.

A typical human pregnancy lasts about 40 weeks from the last menstrual period.

A female frog can produce around 5000 eggs in a single spawning.

The typical volume of amniotic fluid at 36 weeks is about 800 mL.

The typical weight range of a full-term newborn is 3-4 kg.

The vital capacity of an average adult human is approximately 4-5 liters.

The diaphragm is the primary muscle responsible for inhalation; it contracts and moves downward, increasing the thoracic cavity volume.

The diaphragm is the primary muscle responsible for inhalation; it contracts and moves downward, increasing the thoracic cavity volume.

Approximately 90% of all animal species are invertebrates.

In a healthy adult, plasma typically makes up about 55% of total blood volume.

Inhaled air typically contains about 21% oxygen.

Cilia are hair-like structures that line the respiratory tract and help trap and move particles out of the airways, keeping the lungs clear of debris.

The liver detoxifies harmful substances and produces bile, which aids in fat digestion.

The inner cell mass of the blastocyst develops into the embryo, while the outer layer forms the placenta.

Capillaries are the smallest blood vessels and are primarily responsible for nutrient and gas exchange.

Most animals exhibit bilateral symmetry, which allows for a distinct head and tail end.

Most echinoderms exhibit radial symmetry, particularly as adults, allowing them to interact with their environment from multiple directions.

Echinoderms exhibit radial symmetry, which means their body parts are arranged around a central axis.

Most echinoderms, such as starfish, exhibit radial symmetry, especially as adults.