Which of the following best describes the fate of energy in ecosystems? a. it will ultimately be recycled back into the ecosystem. b. it flows from secondary consumers to primary consumers. c. it enters most ecosystems in the form of sunlight. d. it flows through and is used by ecosystems

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?

This is a biological reaction due to a stimulus. i need this quickly !

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).