natural

Lower in pitch by one half step

A musical note that is one semitone higher

A gas from underground that burns to make heat and electricity

Things from nature that people use for energy, food, or money

A process in which plants and animals better suited to their home survive and have more young

A set of moral rules that come from human nature and apply to everyone

The place where a plant or animal normally lives and grows

An ability someone is born with to do something well

Light that comes from the sun, not from lamps

A change that happens in the world without human help

The condition of land, water, or wildlife left unchanged by people

The study of plants and animals by watching them

A talent someone is born with that they do not learn

A material found in nature that people use, like water or oil

An event in nature not caused by people

A branch of science that studies the physical world, like physics and biology

Giving birth with little medical help and no drugs to reduce pain or help the birth

The body's protection from disease that a person has naturally without a vaccine or previous infection

The regular way the physical world follows rules not made by people

A material from plants or animals that people use to make cloth

The study of the physical world and its laws, like early physics

A system people use to speak and write to each other rather than computer code

A place where water from underground comes out

A way to avoid pregnancy by not having sex during a woman's fertile days, without using medicine or devices

A number used for counting that starts at one and goes up

The way computers understand and work with human language

A thing that exists without people making or changing it

A person who studies plants, animals, and where they live

A logarithm that uses the number e, about 2.718, as its base

An elastic material made from the sticky sap of certain trees used for many products

Study that uses reason and nature to learn about God, not holy books

A substance from nature that soothes irritated skin or throat

A low hollow in the ground that often holds water

A shiny rock that forms when lava cools very fast

The original color of a person's hair before it is dyed

A player who moves the ball past opponents with skill and ease

A salt from Bad Ems mineral waters that treats throat and nose infections

An area of land surrounded by natural features like hills or trees

An ability a person has from birth

The natural resources a country has, like land or oil

A program that reads, understands, or writes human language text

A computer program that understands and produces written or spoken language

A sticky material some plants make, like amber, that people use in varnish and glue

A person who wakes up early without an alarm

A person who easily convinces other people to agree or act

A moral quality people can have by nature, not given by God, like justice

The form of something made by nature, not changed by people

A normal relaxed way of speaking that sounds honest

An important English society that supports scientists and promotes science