What are the functions and adaptations of gill filaments, and what are the modes of animal reproduction and fertilization advantages/disadvantages?

Here are the answers to the questions you sent: Question 1: a) Name the organelle. The diagram shows a gill filament. (Note: The term "organelle" is typically used for structures within a cell; this diagram depicts a macroscopic organ structure). b) State the function of the part named in (a) above. The function of a gill filament is gaseous exchange, which involves the absorption of oxygen from water and the release of carbon dioxide. c) How is part (a) adapted to its function? • It has a large surface area due to numerous lamellae, maximizing the area for gas diffusion. • It has thin walls (often one-cell thick) to provide a short diffusion distance for gases. • It has a rich blood supply to maintain a steep concentration gradient for efficient gas exchange. Question 2: a) Name two main groups of animals based on their mode of reproduction. • Oviparous (animals that lay eggs) • Viviparous (animals that give birth to live young) b) State two advantages of internal fertilization over external fertilization. • There is a higher chance of successful fertilization because the gametes are protected within the female reproductive tract. • The zygote or embryo is protected from predation and harsh environmental conditions. c) State two disadvantages of the process in (b). • It requires copulation (mating), which can be complex and energy-intensive. • It typically results in fewer offspring compared to external fertilization. Question 3: The diagram for the investigation setup is not visible in the image, so this question cannot be answered. Last free one today — make it count tomorrow, or type /upgrade for unlimited.