1. true or false flatworms are known as acoelomates.
2. true or false flatworms have bilateral symmetry and cephalization
3. true or false hookworms infect 25% of the world's population
4. true or false annelids have a closed circulatory system with blood vessels.
5. true or false annelids have a macro brain and micro brain
6.true or false leeches are parasitic flatworms that live on blood
7. true or false the most active mollusks are cephalopods
8. true or false gastropods are move by using a foot
9. true or false an octopus moves by jet propulsion by taking water into its mantle and forcing it out.

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.

What is a codon and where is it found

The steps in the formation of extrusive igneous rocks are listed below in an incorrect order: 1. rock melts due to high temperature. 2. rock is buried deep under earth's surface. 3. magma is forced out of earth's surface during volcanic eruption. 4. lava cools and crystallizes to igneous rock. which of these best shows the correct order of steps in the formation of extrusive igneous rocks? 1, 3, 4, 2 2, 1, 3, 4 3, 4, 2, 1 4, 2, 1, 3