Explanation

Horny structures, like the horns of cattle, are made of keratin and do not shed off.

Unlike antlers, which are shed annually, horns are permanent structures that continue to grow throughout the animal's life

The other options—scales, feathers, and fur—are either shed or replaced regularly.

Explanation

In the complex  [ 𝐹 𝑒 ( 𝑁 𝐻 3 ) 6 ] ^2 + , iron (Fe) is in the +2 oxidation state, meaning it has a  𝑑6 electron configuration.

Ammonia (NH₃) is considered a strong field ligand under Crystal Field Theory (CFT), causing the electrons in the 𝑑-orbitals to pair up due to the large splitting of the 

𝑑-orbitals.

In a strong field environment, the electrons occupy the lower energy  𝑡2𝑔 orbitals first, and all six electrons pair up, leaving no unpaired electrons.

Therefore, the number of unpaired electrons is 0.

Explanation

When a harmless species mimics the appearance of a more harmful or poisonous species to avoid predators, it is known as Batesian mimicry.

This form of mimicry helps the harmless species gain protection from predation by resembling a species that predators avoid.

Explanation

When the same species of insect gives rise to different forms or varieties due to adaptation to different environments or ecological niches,

it is referred to as polyphenism.

Polyphenism is the occurrence of multiple distinct forms (phenotypes) within a single species depending on environmental conditions or other factors.

Explanation

None of the options listed (coal, oil, natural gas) are renewable sources of energy.

They are all fossil fuels and are considered non-renewable 

Renewable sources of energy include:

• Solar energy
• Wind energy
• Hydropower
• Geothermal energy
• Biomass

Explanation

The release of hormones by the pituitary gland is regulated by releasing hormones and inhibiting hormones produced by the hypothalamus.

Specifically, the growth hormone-releasing hormone (GHRH) stimulates the release of growth hormone (GH) from the pituitary, while somatostatin inhibits its release.

Explanation

In gymnosperms, the ovule is covered by an integument, which is a protective layer.

Explanation

In a DC (direct current) circuit, the most fundamental and commonly referenced basic circuit element is the resistor.

Here's why:

Resistor: In a DC circuit, a resistor is used to control the current and voltage levels.

It provides a specific amount of resistance, which determines how much current will flow for a given voltage according to Ohm's Law (𝑉 = 𝐼/𝑅).

Explanation

The Sun is a 4.5 billion-year-old yellow dwarf star

The Sun is a hot glowing ball of hydrogen and helium

***

5 billion years the Sun will become a big, cool star called a red giant.

A few billion years after that, it will become a small white dwarf star.

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Explanation

 Intelligence is influenced by multiple factors, including:

• heredity (genetics)
• environment (upbringing, social interactions)
• education (access to learning resources and opportunities)