Life functions

• Life functions - All living this carry out certain activities or functions in order to maintain life.
• Nutrition - is the process of ingesting and absorbing food to provide the energy fir life, promote growth and repair damages tissues.
• Transport - involves movement of nutrients water, ions, and other materials into and out of the various cells and tissues of organisms. This process includes absorption of small molecules across cell membranes and secretion of biochemicals such as enzymes, mucous , and hormones.
• Metabolism - includes the process by which nutrients and simple molecules are used to form complex molecules (anabolism). Metabolism also includes the process of breaking down complex molecules to release from chemical bonds (catabolism)
• Digestion - a special form of catabolism that breaks down food into smaller molecules and releases energy.
• Absorption - allows small molecules to pass through cell membranes throughout the body tissues. This allows for a gas exchange
• Excretion - the elimination of waste products
• Reproduction - the process by which an organisms produces offspring either sexually or asexually
• Asexual - is the reproduction without the use of gametes or sex cells. One parents organism can reproduce by itself
• Fission - is the splitting of the body of an organisms into two identical parts
• Budding - is the growing of bud out of the parent cells of bodies which when detached can grow into another organism that resembles the appearance of parent
• Sporulation - the spore formation as in fern plant and mushrooms.
• Sexual - requires the union of male and female gametes called "fertilization"
• external fertilization - the union of sperm and egg cells happen outside the body of the female organisms
• internal fertilization - the union of sperm cells and egg cells happen inside the body of a female organism
• Cells - are the smallest structures capable of basic life processes, such as taking in nutrients, expelling waste, and reproducing.
• Prokaryotic cell - found only in bacteria and archaebacteria. unicellular organisms. can be rod like, spherical, or spiral in shape, are surrounded by a protective cell wall. live in a watery environment
• Plasma membrane - is selectively permeable, meaning it allows only certain substances to pass through. separates the cell's contents from its surrounding fluids