Present tense: I canât even find someone to lay tiles. Past simple tense: She laid her hand upon his arm. Present continuous tense: Weâre laying the groundwork for long-term economic growth. Past perfect tense: The government had laid their cards on the table. lie (1) = be in a horizontal position on a surface.
All the metabolic wastes are excreted in a form of water solutes through the excretory organs (nephridia, Malpighian tubules, kidneys), with the exception of CO2, which is excreted together with the water vapor throughout the lungs. The elimination of these compounds enables the chemical homeostasis of the organism.
1 The excretory system helps maintain homeostasis by removing all waste material from the body; the skin sweats (which also helps to cool the body); the kidneys filter chemicals in the blood; the liver filters toxins and acids from the blood; and the colon allows solid waste to pass from the body.