Answer:
c
Explanation: this is the correct answer
Answer:
Calcium ions
Explanation:
The excitation-contraction coupling process is the process by which the electrical activation of muscles (the depolarization of the action potential) leads to the activation of contraction.
An action potential in the skeletal muscles or muscle excitation leads to Ca release from the sarcoplasmic reticulum via calcium channel protein. Released Ca regulates the contraction of the muscle.
The two cell organelles involved in energy conversion are chloroplasts and mitochondria.
Chloroplasts are found plants. They are the photosynthesizing organelles of all photosynthetic eukaryotes.
Mitochondria are found in both plants and animals. It converts food such as sugars into the chemical ATP, the main source of energy for cell work.
Both organelles are said to evolve through a process called "endosymbiosis".
Answer:
recorded on a water bottle
Most stinging cells or underground, like nests {glad to help}