Answer:
Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber. The sodium influx also sends a message within the muscle fiber to trigger the release of stored calcium ions. The calcium ions diffuse into the muscle fiber.
Explanation:
B is false, enzymes speed up the reaction by lowering the activation energy needed for the reaction to start.
Answers B
Answer:
Anatomy. Species may share similar physical features because the feature was present in a common ancestor (homologous structures).
Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.
Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.
Fossils. Fossils document the existence of now-extinct past species that are related to present-day species.
Direct observation. We can directly observe small-scale evolution in organisms with short lifecycles (e.g., pesticide-resistant insects).
Hello :), nitrogen have 7 protons and 7 electrons.
Answer:
Exist in fixed amounts
Cannot be replaced in a short time
Are used faster than they are replaced
Explanation:
Non renewable resources, as the name suggests, cannot be renewed. They are finite resources, meaning they run out. They exist in fixed amounts, which means they are limited. These types of resources can be replaced but it takes a long time. For examples, crude oil. Crude oil is produced by the natural geological occurences but it takes millions to billions of years to be produced. So eventually, we are going to run out of it because people use it up in a significantly lesser time.
