You have to put a lid on petri dishes in order to ensure that no outside contaminants get inside the dish.
Answer:
Our sun oriented framework shaped almost 4.5 billion a long time back from a thick cloud of interstellar gas and tidy. The cloud collapsed, conceivably due to the shockwave of a adjacent detonating star, called a supernova. When this tidy cloud collapsed, it shaped a sun oriented nebula—a turning, twirling disk of fabric.
Answer:
Phagocytosis
Explanation:
Both macrophages and neutrophils are phagocytes, this means that they engulf large cells (up to 0.5 µm) to kill them, or small particles in order to eliminate them from the circulation.
Phagocytes can be used to acquire nutrients but their most important task is to kill invading pathogens as a part of the immune system.
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Answer is stretch receptors.
Stretch receptors respond to the distention of muscle wall of the bladder and are neurologically linked to the medulla. Stretch receptors in the bladder signal the parasympathetic nervous system to stimulate muscarine receptors, present in the detrusor muscle, to make him contract. This leads to the expulsion of urine.
Answer: The sun hits different points more directly than others
Explanation: