Explanation

Diastole is the phase of the cardiac cycle where the heart muscle relaxes.

It allowing the chambers to fill with blood.

Explanation

Digital TVs do not emit Y or X-rays.

They emit electromagnetic radiation in the form of radio waves to transmit audio and video signals.

X-rays are a form of ionizing radiation used in medical imaging and other specialized applications,

but they are not produced by digital TVs.

Explanation

Facilitated diffusion is a type of passive transport that uses carrier proteins to move specific substances across the cell membrane without energy input.

This process allows cells to regulate the movement of essential molecules, like sugars and amino acids, into or out of the cell.

Explanation

Radioactive isotopes, such as carbon-14 and uranium-238, decay at a steady rate.

It allowing scientists to measure the age of fossils and rocks.

This technique is known as radiometric dating.

Explanation

The nucleus, which consists of protons and neutrons.

It is incredibly dense and occupies a very small volume compared to the extra-nuclear part (electrons).

However, the nucleus contains most of the atom's mass due to the significant mass of protons and neutrons.

Explanation

Cotton is a natural fiber that contains a very high percentage of cellulose, typically around 95%.

Cellulose is a polysaccharide (a long chain of glucose molecules) that provides strength, structure, and durability to plant cell walls.

Cotton is one of the purest forms of cellulose, making it a valuable resource for textile production.

Explanation

Near Earth's surface, the acceleration due to gravity (g) is approximately 10 meters per second squared (10 ms^-2).

This is a fundamental constant that describes the strength of gravity on our planet.

Explanation

• A non-metal atom forms an anion (a negatively charged ion) by gaining one or more electrons.
• This means that the atom acquires additional electrons to form a negative ion.

Explanation

A Lewis base is a substance that donates a pair of electrons to form a coordinate covalent bond.

This means that a Lewis base is an electron pair donor.

Explanation

A biogeochemical cycle is the process by which elements are recycled through an ecosystem, passing through both living organisms (biotic factors) and non-living components (abiotic factors) like air, water, and soil.

This cycle involves the movement of elements like carbon, nitrogen, oxygen, and phosphorus through the environment and living things.