Macromolecule helps with transport of Proteins. Hence the correct option is d.
Homeostasis is maintaining constant internal conditions. Hence the correct option is b.
Proteins play a crucial role in transport processes within living organisms. Specifically, certain proteins, such as transport proteins, facilitate the movement of substances across biological membranes. These proteins serve as carriers, channels, or pumps, aiding in the transport of ions, molecules, or even larger structures across cell membranes. For example, integral membrane proteins in cell membranes can actively transport ions or facilitate the passive diffusion of molecules by creating channels. Hence the correct option is d.
Homeostasis refers to the maintenance of relatively constant internal conditions within an organism, ensuring a stable and optimal environment for cellular activities. This regulation involves various physiological mechanisms that balance internal factors such as temperature, pH, and concentrations of ions. Homeostasis is essential for the proper functioning of cells and tissues, allowing organisms to adapt to changes in the external environment and maintain internal stability. Hence the correct option is b.