A) sinoatrial node, atrioventricular node, atrioventricular bundle, bundle branches, Purkinje fibers.
Answer: Sun, clouds, vegetation or plants, little wind, Hill.
Explanation:Riding on my bike,towards the top of the hill, I know water cycle is happening, this is evident first from the SUN which had risen in the morning, heats up the LAKES ( water body ) while also providing energy for PLANTS which gives off water vapor through transpiration. That vapor then evaporates to atmosphere to form bright CLOUDS. because it is a warm summer day , there is less WIND which does not move the clouds to form rain. The big gulp of COLD WATER I saw on the HILL should be from the result of accumulated rain water. This will gradually infiltrates into the GROUND to return to the ocean. And thus cycle continues.
The water cycle, therefore is a continuous movement of water on every part of the surface of the Earth by processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow through different forms of liquid, solid (ice) and vapor.
Answer: The means for transmission of disease-causing microorganism is provided by the direct or indirect contact.
Microorganisms can cause disease only once they are transferred to the body. The disease causing microorganisms are termed as pathogens which are transmitted by several ways such as from skin to skin, by nuclei droplets, through blood and body fluids or via air. In vector transmissions the disease is carried by the parasitic insects via animals, air borne transmission occurs when microorganisms move through air or the dust particles, droplet transmission occurs by coughing, sneezing or talking by the person who is infected while indirect transmission occurs by physical contact or by touching contaminated objects.
The effects of the intertidal zone on two species of snails, and how an adaptation can help in an organism's survival.
Periwinkle (Littorina specie) is a very common snail that is found in the upper intertidal zone due to their adaptation abilities which increase its survival in its environment. They are small in size i.e. less than 1/4 inch and feed on micro algae that grows on the exposed rocks.
Snails close them in shells and excrete a sticky mucous that firmly attaching the animal to the rock of seagrass. so we can conclude that adaptation can help in an organism's survival.
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