All of the following have an internal skeleton except

a. sand dollars.

b. sand fleas.

c. sea stars.

d. sea lilies.

Blood has traveled from the heart to the toes. Which describes the next step of the circulation process? A. The blood releases oxygen on the way back to the heart. B. The blood travels to the lungs to get oxygen. C.

How has technology change farming

Define the tissue level of organization and indicate how cnidarians exhibit this phenomenon

Witch compound contians radical? Co, naoh co2, co

Detergents can be used to reduce microbial concentrations and all of the following are true except: a. they are polar molecules that act as surfactants. b. the most effective ones are positively charged. in low concentrations they are bacteriostatic.

Sally and Harry fall in love. They introduce Sally's identical twin, Emily, to Harry's identical twin, Ken. Soon there is a double wedding where Sally marries Harry and Emily marries Ken. Both Sally and Emily get pregnant.

Which process moves water molecules across the membrane of a cell? diffusion endocytosis exocytosis osmosis

Which of these is NOT a main type of tissue? connective skeletal nervous muscle

Which of the following is true with respect to mutagens? Mutagens are chemical or physical factors that increase the rate of mutation. Mutagens are the genes that cause mutation. Mutagens are inheritable characters that develop mutation.

Who was the first person to observe a living cell in a drop of pond water.