Answer: because of the pandimic
it startExplanation: coronvires is the probelm over 4 years it started in 2019 to 2022 it even more year well never know.
Answer;
-Pure chemical substance and element
Explanation;
-Pure substances are substances that are made of only one type of atom or molecule.A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary.
-An element is a pure substance that cannot be broken down into different types of substances by chemical means. All elements are pure substances. An element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element.
-Tungsten is an element and therefore a pure substance.
Answer:
organelle- part of a cell (example- mitochondrion)
cell- basic unit of structure (example- muscle cell)
tissue- group of some cells (example-muscle tissue )
organ- one or more types of tissue (example- stomach)
organ system- group of organs working together (example- digestive system )
Organism- individual living thing (example- goat )
Explanation:
Organization of living things! Hope this helps.
