Exam: TOEFL

Definition: The development of an individual organism from the earliest stage to maturity, including all the changes it undergoes during its life.

Example: The study of ontogenesis helps scientists understand how organisms grow and develop over time.

Definition: The process of development of an individual organism from its earliest stage as an embryo to its mature form.

Example: The study of ontogeny helps scientists understand how organisms grow and develop over time.

Definition: A person who studies the nature of being, existence, or reality, often focusing on the categories of being and their relations.

Example: The ontologist presented a fascinating theory about the nature of existence.

Definition: A difficult responsibility or obligation that someone has to deal with.

Example: The onus is on the manager to ensure that the project is completed on time.

Definition: A protective structure where certain types of parasites develop and can be transferred to new hosts.

Example: The oocyst is essential for the life cycle of the parasite, allowing it to survive outside the host.

Definition: A type of cell that develops into an egg in females; it is involved in reproduction.

Example: The oocyte is crucial for the process of fertilization in many animals.

Definition: The process by which an egg cell is formed and matures in the female reproductive system.

Example: Oogenesis is essential for reproduction in many animals, including humans.

Definition: A person who studies or collects birds' eggs.

Example: The oologist carefully examined the eggs for signs of damage.

Definition: A medical procedure in which one or both ovaries are surgically removed from a woman's body.

Example: After the diagnosis, the doctor recommended an oophorectomy to prevent further health issues.

Definition: The quality of being difficult to see through or understand; lack of transparency.

Example: The opacity of the glass made it hard to see inside the room.