What are species ?

ANS: Scientist group living organisms in to diffrent kinds , called species .

. A species is a group of organisms that all share the same characterastics .

key word

. classification

. It shows how every type of organism we know of is connected to all the others .

Non-metals are elements that mostly lack the properties of metals and can exist as gases, liquids, or solids. They are usually dull and not shiny, except for some like iodine. Non-metals are generally poor conductors of heat and electricity, with an exception being graphite, a form of carbon that can conduct electricity. Their melting points tend to be lower than metals, and they are brittle, meaning they break easily and cannot be bent or shaped. Chemically, non-metals have high electronegativity and ionization energy, so they tend to gain electrons in reactions, forming negative ions and acidic oxides when combined with oxygen. Non-metals include elements such as carbon, sulfur, iodine, oxygen, and hydrogen. Some non-metals, like carbon, show allotropy, existing in different forms with distinct physical properties, such as diamond and graphite. Non-metals do not exhibit malleability or ductility, unlike metals, and they do not produce metallic bonding which accounts for…

Muscles are soft tissues in the human body made up of special cells called muscle fibers that can contract and relax. They help the body move by pulling on bones through tendons. Muscles are elastic, which means they can contract without breaking and then return to their original shape. There are over 600 muscles in the human body, and together with bones and joints, they allow all kinds of body movements. Muscles also protect our organs and help maintain posture and body stability. They can be divided into three main types: skeletal muscles, which are attached to bones and help with voluntary movements; smooth muscles, found inside organs and responsible for involuntary actions; and cardiac muscles, which are found only in the heart and control heartbeat. The nervous system directs muscles to contract and relax so we can move and perform tasks. Muscle contractions convert chemical energy into mechanical energy…

Plants use water in photosynthesis, the process that makes their food. Inside the leaves, sunlight gives energy to split water into hydrogen and oxygen. The hydrogen combines with carbon dioxide from the air to form glucose—the plant’s food. The oxygen is released into the air. So, without water, plants cannot make energy or grow.

Water also transports minerals and nutrients. The roots absorb water from the soil, and the minerals in the soil dissolve in it. This mixture travels through tiny tubes called xylem all the way up to the leaves. The movement happens because water naturally moves from areas of more water (in the soil) to areas of less water (inside the plant).

Another vital job of water is to keep the plant firm and upright. Each cell in a plant holds water that presses against its walls. This pressure, called turgor pressure, keeps stems and leaves stiff. If…

People use a lot of energy each day .

. our body use energy for moving , for thinking , for growing and keeping warm .

Energy - is the ability to do work .

Question

1. From were do we get energy ?

   ANS: Well, according to the law of conservation of energy.

Introduction

Contact process is an industrial method involving reversible reactions for manufacturing Sulphuric acid. It comprises 3 primary steps.

Step 1

Sulphur is combusted with oxygen to form sulphur dioxide. It's equation is :

S8 + 8O2 = 8SO2

The raw material needed for the contact process are sulphur, air, and water. Sulphur can be mined in various parts of the world, but large quantities are obtained from removing the impurities from fossil fuels (the process is known as desulphurisation)

when energy is given to an atom, its electrons absorb that energy and jump to a higher shell.

this is called an excited state, but it is not stable.

1. - after a very short time, the electrons fall back down to their normal shells.

   - when they fall, the electrons release the extra energy they had absorbed.

   - this energy comes out as light.

   - the color of the light depends on how much energy is released when the electrons move down.

On substraction i got correct 8/14

In english spellings i got correct 7/8