A student creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. The next day, all the snails are dead. What is the most likely cause of their death? O A. The rates of cellular respiration and photosynthesis in the tank were both too low. B. The rates of cellular respiration and photosynthesis in the tank were both too high. C. The rate of cellular respiration in the tank was much higher than the rate of photosynthesis. D. The rate of photosynthesis in the tank was much higher than the rate of cellular respiration.

Y’all i need answers plss people are saying me and my brother look alike although we’re two different ages. one year apart i’m a girl, btw i’m thinking we could be fraternal twins idk my parents and my friends think we look alike

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).