Explanation

The renal cortex is the outermost, darker part of the kidney.

It responsible for filtering blood and producing urine.

Explanation

The structure of the earth is divided into four major components:

1. the crust,
2. the mantle,
3. the outer core,
4. the inner core.

Explanation

Arachnids, such as spiders and scorpions, are distinguished by having eight legs, a characteristic feature of this class.

Explanation

Ostriches, like some other birds, eat pebbles and small stones to help with digestion. 

They swallow these pebbles, which then accumulate in their gizzard, a muscular organ in the digestive system.

The pebbles help grind up the food.

It especially tough plant material, in the gizzard, making it easier to digest.

This process is called "grit digestion".

Explanation

Epistasis occurs when the expression of one gene is affected by another gene at a different locus.

This interaction can mask or modify the effects of the other gene, leading to variations in phenotypes.

Explanation

The nucleolus is the site within the nucleus where ribosomal RNA (rRNA) is synthesized and combined with proteins to form ribosome subunits.

Explanation

Phenotype refers to an individual's observable traits, such as height, eye color and blood type

A person's phenotype is determined by both their genomic makeup (genotype) and environmental factors.

Explanation

Bromine (Br2) is the only halogen that exists in a liquid state at room temperature.

It is a reddish-brown liquid with a melting point of -7.2°C or 19°F.

Explanation

The mass extinction event that led to the demise of dinosaurs occurred at the end of the Cretaceous period, approximately 66 million years ago.

Explanation

A body is in equilibrium when the net force acting on it is zero, and it is not changing its motion.

This means that the body is either at rest or moving with a constant velocity (uniform speed), but not accelerating.