Explanation

The pharynx (throat) is a shared passage for both the respiratory and digestive systems.

The trachea (windpipe) and esophagus both connect to the pharynx:

• The trachea connects to the pharynx anteriorly (front) and leads to the lungs.
• The esophagus connects to the pharynx posteriorly (back) and leads to the stomach.

Explanation

• The high resolution of the electron microscope is primarily due to the short wavelength of the electron beam.
• This shorter wavelength allows for higher resolution and the ability to visualize smaller structures.

Explanation

Most protists are aquatic, meaning they live in water environments, such as oceans, rivers, lakes, and wetlands.

Many protists are single-celled and microscopic, while others are multicellular and macroscopic.

Explanation

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

It allowing the chambers to fill with blood.

Explanation

Each gram of fat supplies the body with approximately 9 calories.

This is more than the energy provided by carbohydrates (4 calories per gram) and protein (4 calories per gram).

Explanation

Homologous pairs are chromosomes that are similar in shape, size, and genetic content, and contain the same genes in the same order.

They are pairs of chromosomes that are inherited one from each parent.

They are responsible for determining the traits and characteristics of an organism.

Explanation

Root hairs are thin, hair-like structures that extend from the roots of plants, increasing the surface area for absorption of water and nutrients from the soil. They play a crucial role in:

• Absorbing water and minerals
• Anchoring the plant in the soil
• Facilitating the uptake of nutrients

Explanation

Iron deficiency is associated with decreased cognitive abilities and resistance to diseases.

Iron plays a crucial role in the immune system, and deficiency can impair the body's ability to fight off infections.

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

• Red meat is a good source of protein and other nutrients.
• It is not a significant source of calcium.