1. Immune system will protect you.

2. but sometimes, your immune system gets weak.

Determinants of Price Elasticity of Demand (PED)

These are the factors that decide how strongly people react when the price changes.

1. Substitutes (Other Choices)

• If people can easily find another product, they will switch when the price goes up → Elastic Example: Pepsi and Coca-Cola.

• If there are no other options, people still buy it → Inelastic Example: Medicine or toothpaste.

2. Income (Money Spent)

A species is a group of living things that share many things in common. They look alike, live in similar ways, and can have babies with each other. The babies they have can also grow up and have babies of their own.

Each species has its own special features. For example, all humans belong to one species because all people can have children together. All dogs belong to another species because all dogs can have puppies together.

Different species cannot have babies together. For example, a cat and a dog are too different. Their bodies, size, and the way their insides work are not the same, so they cannot have babies together.

Every species has its own kind of food, place to live, and way of surviving. Fish live in water and breathe through gills. Birds live on land or in trees and breathe air through lungs. Lions hunt for…

i did khan academy and did you know \large 554984 + 23023 = 578007

The parts of a flower:

Cell Structure

• When a very thin slice of a plant stem is looked at under a microscope, it looks like it’s made up of many small box-like parts — these are cells.

• The slice in the picture is magnified 60 times. So if a cell looks 2 mm long in the image, in real life it’s only 0.03 mm long.

• Such thin slices are called sections.

Types of Sections

1. Longitudinal Section – Cut along the length of the stem (you see the inside part stretched out).

Scalar Quantities

A scalar quantity does not tell us the direction. You can describe it with just a number and a unit.

Examples:

• Mass – 5 kg

• Time – 10 second

• Temperature – 25°C

Acids are substances that release hydrogen ions (H⁺) in water, making the solution acidic. They have a pH less than 7. Examples include lemon juice and vinegar. Alkalis are substances that release hydroxide ions (OH⁻) in water, making the solution alkaline. They have a pH greater than 7. Examples include baking soda and soap. The pH scale measures how acidic or alkaline a solution is, ranging from 0 to 14. When acids and alkalis mix, they react in a neutralization process. This reaction produces salt and water. Neutral solutions have a pH of exactly 7. Indicators like litmus paper change color to show if a solution is acid or alkali. This helps us test and understand different substances.

1. Acids are substances that release hydrogen ions (H⁺) in water and have a pH less than 7.

2. Alkalis are bases that dissolve in water and release hydroxide ions (OH⁻), with a pH…

Microorganisms are tiny creatures you cannot see.Some help make food like bread and yogurt grow free.Yeast helps dough rise and makes bread soft and light.Good bacteria turn milk into cheese just right.Microbes help vegetables ferment and taste yummy.But some germs in food can make your tummy feel crummy.They spoil food, so we keep it cold or sealed tight.Washing hands and cooking well keeps food safe and bright.Microbes work hard in soil, helping plants grow.They can be friends in food and nature, this you should know.

1. Microorganisms are tiny living things that we can see only with a microscope.

2. Some microorganisms help make food like curd, cheese, and bread through a process called fermentation.

3. Good bacteria in yogurt help our stomach digest food better.

4. Yeast, a type of fungus, helps bread dough rise and become soft.

5. Some microorganisms can spoil food by making it rot or smell bad.