Explain what is a pathogen and why it can make someone sick?

Answers

Answer 1

Answer: a python is a forgein body that enters the human body. (for example it's like pollen for people thay have allergies) it makes people sick becaise the body identifies it as a threat and tries to expell it

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How does rust make steel weak?

Answers

The reddish-brown flakes we found in metals are called rust. Rust are iron oxide. It is the product when an iron reacts with oxygen. Which is why metals rust when exposed to air and water. The process is called corrosion. By then metals get weaker because the strong irons are replaced with iron oxides which are flaky powder.

What are the 2 ways the Deccan Traps could have killed the dinosaurs?

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It is not clearly explained to how they killed dinasours but the Deccan trap caused the continent to break apart, caused by explosion and this included end age of dinasours

After the skin is cut and a capillary wall breaks, what's the first step in working to form a clot? A. A set of reactions are triggered. B. Thrombin causes sticky fibrin filaments to form the clot. C. The clot seals the area to prevent further blood loss. D. Platelets clump at the site.

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The best answer is A.As soon as the blood vessel wall is broken or damaged, a series of reactions activate platelets so that they stick to the site of injury. The platelets are able to hold to the blood vessel wall by means of a protein substance called von Willebrand's factor.Collagen and thrombin then act at the site of injury and induce platelets to clump or stick together, forming a mesh that plugs the broken part. Special clotting protein help sequester more platelets to the plug which finally becomes a blood clot.

Because the United States imports about 4 billion barrels of crude every year, at best, the Arctic National Wildlife Refuge could provide us with nearly one hundred years worth of oil. True False

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The given statement is false.

The Artic National Wildlife refuge could not provide the united states with one hundred year worth oil. The United states Imports about 4 billion barrels of crude oil.This refuge cannot supply united states with this much of oil because ever since it has became a refuge there has been no drilling and no seismic work has been done there.

False, the Arctic National Wildlife Refuge can not provide us with nearly on hundred years worth of oil.

Explain why multicellular organisms require a ventilation system?? include reasons on
surface area to volume ratio
cells depp within the body
and number of cells

Answers

Ventilation maintains a steep concentration gradient, blood at the exchange surface usually has lower O2 and higher CO2 content than the air (of for fish, the water) at the exchange surface. This is what allows for diffusion of O2 into the blood and CO2 out of the blood. Multicellular organisms have a greater number of cells so will have a higher energy demand than single cellular organisms, this demand can only be met by allowing the cells to respire, a ventilation system brings oxygen molecules which are a raw product of respiration into the hemoglobin of the blood to be transported to tissues. As surface area : volume ratio is very low so if there was no ventilation system and the organism instead relied on exchange of materials through the exposed skin it would be very difficult to met the high energy demand as less O2 and CO2 would be able to be exchanged.

In multicellular organisms, the division of labor provided by these bodies grouped into specialized devices imposes a number of constraints.

One of the constraints is that it is necessary for all cells in the body to be well supplied with both nutrients and oxygen. The transition to multicellularity requires the establishment of a circulatory system and a respiratory system for the supply and purification systems for the disposal of waste.

The amount of oxygen required to breathe depends on:

Ratio surface / volume plus it is small and the intake by the respiratory system must be important.

The depth of the cells, which evolves proportionally with the oxygen supply required.

The number of cells that also evolves proportionally with the oxygen supply required.

Meiosis results in greater genetic variation thanasexual reproduction because it?? Help please

Answers

This is because of independent assortment at metaphase, crossing over at prophase I, and also, sexual reproduction occurs between two gametes each with different genetic material. There's random mating and also random fertilization (which sperm gets the egg).

Answer:Ninjbhwhi

Explanation:

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