What chambers of the heart receive blood from the body, ventricles or atria? what chambers of the heart pump blood out of the heart, ventricles or atria? which heart chamber has the thickest muscle wall? 20.why is it necessary for the chamber in the above question to have a thicker muscle wall? which blood vessel brings oxygen poor blood to the heart from the rest of the body? which blood vessel takes blood from the heart and sends it to the lungs? which blood vessel takes oxygen-rich blood from the lungs and brings it back to the heart? which blood vessel sends oxygen-rich blood from the heart to the rest of the body? how do the valves control the flow of blood through the heart? answer the conclusion questions.

Salmonella typhimurium is a food-borne bacterial pathogen that can cause severe gastrointestinal disease. salmonella is often phagocytosed by macrophages that normally destroy bacterial pathogens, but this bacterium is somehow able to prevent the complete maturation of phagolysosomes. salmonella is able to tolerate the low ph of phagolysosomes, and in fact responds to the drop in ph by secreting toxins that interfere with other cellular responses. which of the following differences would you expect to contribute to the survival of a bacterium within an salmonella-containing phagosome, compared to a healthy phagolysosome? decreased activity of acid hydrolases increased activity of acid hydrolases decreased import of h+ ions increased import of h+ ions my guess is decreased activity of acid hydrolases but i'm not sure.

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?