The correct option is ANALOGOUS STRUCTURES.
Analogous structures are structures that are similar because of the functions they carry out and because of their external appearance. But these structures are different internally.<span />
The tiny filtering units in the kidney are the nephrons
I believe that classical conditioning is a type of learning in which a neutral stimulus comes to elicit a response after being paired with a stimulus that would elicit the same response naturally. It is where a conditioned stimulus becomes associated with an unrelated unconditioned stimulus in order to produce a behavioral response which is referred to as a conditioned response.
Answer:
Calcium ions
Explanation:
For muscle contraction to occur, Troponin, a regulatory protein which regulates the tropomyosin, is activated by calcium ions, and is kept at extremely low concentrations in the sarcoplasm. If these calcium ions are released from the sarcoplasm by signals from neurotransmitters, calcium ions bind to troponin, causing conformational changes in troponin that allows tropomyosin to uncover the myosin-binding sites on actin. Tropomyosin a regulatory protein on the myofibril (composed of actin and myosin filaments) must change its conformation and uncover the myosin-binding site (it hides the binding site) on an actin molecule, thereby allowing cross-bridge formation between the actin and the myosin head. Once the tropomyosin is removed, a cross-bridge can form between actin and myosin, triggering muscle contraction.
Answer:
the level of carbon dioxide in Earth's atmosphere has been rising consistently for decades and traps extra heat near the surface of the Earth causing temperatures to rise