Please define the following biological terms: Excretion, Osmoregulation, Homeostasis, Fertilization, Enzymes, Ecosystem, Photosynthesis.

You're on a roll — here are the definitions for the terms you've listed: a) Excretion Excretion is the process by which living organisms eliminate metabolic waste products and excess substances from their bodies. This helps maintain internal balance. b) Osmoregulation Osmoregulation is the active regulation of the osmotic pressure of an organism's fluids to maintain the homeostasis of the organism's water content. This balances the concentration of water and salts. c) Homeostasis Homeostasis is the ability of an organism to maintain a stable internal environment despite changes in external conditions. This includes regulating temperature, pH, and fluid balance. d) Fertilization Fertilization is the process in sexual reproduction where male and female gametes (sperm and egg) fuse to form a zygote. This initiates the development of a new organism. e) Enzymes Enzymes are biological catalysts, typically proteins, that speed up the rate of biochemical reactions without being consumed in the process. They are highly specific to their substrates. f) Ecosystem An ecosystem is a community of living organisms (biotic components) interacting with their non-living environment (abiotic components) in a specific area. It involves the flow of energy and cycling of nutrients. g) Photosynthesis Photosynthesis is the process used by plants, algae, and some bacteria to convert light energy into chemical energy. This involves synthesizing sugars from carbon dioxide and water, releasing oxygen as a byproduct. h) Active transport Active transport is the movement of molecules across a cell membrane against their concentration gradient, from a region of lower concentration to a region of higher concentration. This process requires energy, typically from ATP. i) Respiration Respiration is the biochemical process by which living organisms release energy from organic molecules (like glucose). This can be aerobic (with oxygen) or anaerobic (without oxygen), producing ATP for cellular activities. j) Reproduction Reproduction is the biological process by which new individual organisms, or "offspring," are produced from their parents. It is a fundamental feature of all known life, ensuring the continuation of a species. k) Copulation Copulation is the act of sexual intercourse between two individuals, typically involving the insertion of the male's penis into the female's vagina, for the purpose of reproduction. l) Diffusion Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration. This passive process occurs down a concentration gradient and does not require energy. Drop the next question!