Explanation

The septum is the muscular wall that separates the right and left sides of the human heart.

It prevents the mixing of oxygenated and deoxygenated blood between the two sides.

Explanation

• Unicellular organisms, like Amoeba and Paramecium, are composed of only one cell.
• Plants (fern and coconut) and animals (hydra and eagle) are composed of many cells, making them multicellular organisms.

Explanation

• Microscopes are used to magnify and observe tiny objects.
• Such as microorganisms, cells, and tiny structures.
• That are not visible to the naked eye.

Explanation

• Chloroplasts are organelles found in plant cells.
• Animal cells do not have chloroplasts.
• That's why chloroplast is a major difference between animal and plant cells.

Explanation

Explanation

Explanation

Sodium is a metal, and metallic bonding involves positive ions in a lattice surrounded by a sea of free (delocalized) electrons.

This structure gives metals properties like electrical conductivity and malleability.

Explanation

When dilute acids react with many metals, they produce hydrogen gas.

For example:

2HCl + Zn → ZnCl2 + H2.

Explanation

When acids react with carbonates, they produce carbon dioxide gas, water, and a salt.

For example:

2HCl + Na2CO3 → 2NaCl + H2O + CO2.

Explanation

Sodium hydroxide (NaOH) is a strong electrolyte because it completely dissociates into ions in water.

It conducts electricity well.

It is used in many industrial processes.