Answer:
The cell was first discovered by Robert Hooke in 1665 using a microscope.
The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s.
Hooke had discovered plant cells -- more precisely, what Hooke saw were the cell walls in cork tissue. In fact, it was Hooke who coined the term "cells": the boxlike cells of cork reminded him of the cells of a monastery.
Answer:
Option (4).
Explanation:
Respiratory system may be defined as the system involves in the exchange of gases between the tissue, lungs and the outside environment. The respiratory system involves nose, mouth, larynx, trachea, lungs, brochi, alevoli and alveolar ducts.
The oxygen is inhaled in the body and carbon dioxide is exhaled out from the body. The oxygen is transferred into the blood stream by binding of oxygen with hemoglobin. The oxygen is diffused in to body due to the partial pressure difference of oxygen and carbon dioxide.
Thus, the correct answer is option (4).
Answer:
C
Explanation:
The crust of the earth is a thin, solid, layer of rock
Carbon and Hydrogen atoms share an electron pair, forming covalent bonds special properties of carbon is ability to form double and triple bonds.
<h3>What is molecule example?</h3>
A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical properties. Further atom division occurs within molecules.For instance, each atoms the particle of oxygen are represented by the letters Oh and Water vapour, together.
<h3>How a molecule is formed?</h3>
When ionic compounds come together and form bonds with one another, a molecule is created. Each atom shares an electron when a bond is formed between them. A molecule is created as a result of a covalent bond.
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