Which of the following is a flap of tissue in the heart that prevents blood from flowing backwards? A. Atrium B. Pacemaker C. Septum D. Valve

Asap brainliest will be which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.

Matched chromosomes carrying information about the same characteristics in the organism are called

Science which of the following is an example of a cyclic behavior that is seasonal? i think the answer is d, i just need to double check : ). a. running from predators. b. searching for water. c. hunting at night. d. migrating for warmth. ***