Changes Over Time and Evolution
Science

A similar structure in different species, like a whale fin, bat wing and your arm
Homologous structure
A similar structure in different species, like a whale fin, bat wing, and your arm. Homologous structure. Homologous structures are body parts in different species that are similar because they evolved from a common ancestor.

Mammals with features like opposable thumbs, forward looking eyes, and a large brain, like humans, monkeys or apes
Primate
Mammals with features like opposable thumbs, forward-looking eyes, and a large brain, like humans, monkeys, or apes primate. Primates are a group of mammals known for their advanced cognitive abilities and dexterous limbs.

An unstable element that emits particles and energy as it changes into another element
Radioactive element
An unstable element that emits particles and energy as it changes into another element. Radioactive element. A radioactive element is a substance that naturally breaks down and releases energy and particles.

The evolution of new species from an existing species
Speciation
The evolution of new species from an existing species. Speciation. Speciation is the process where groups within a species evolve to become distinct species, usually due to physical separation, genetic changes, or environmental differences.