3. look at the illustration in figure 25-2. which letter points to the endoderm
1.a
2.b
3.c
4.d

4. the difference between a prostone and a deuterostome is that
1. a deuterostome only has to germ layers
2. a protostome always develops into an acoelomate
3. the blastopore in a deuterostome develops into the animals anus
4. only prostomes can develop into radially symmetrical adults.

5. which of the following is a fertilized egg?
1. a blastula
2. a zygote
3. a blastophere
4. a pseudocoelom

lol

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.

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes