Chapter 1 The study of life

Scientists discard observations and data that are not consistent with current scientific understanding.

• true

• false

What is a hypothesis?

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What do biologists do?

Living things are made of one or more cells

• true

• false

A small egg on a leaf hatches and a caterpillar crawls out. A few weeks later it forms a hard cocoon. A couple days after that, a big moth appears and flies away.

• Living things evolve as a species

• Living things grow and develop as individuals

• Living things maintain homeostasis

• Living things require energy.

All living things maintain constant, stable internal conditions that keep them happy and healthy. This is called homeostasis. Which is an example?

• Emma put a flake of her dead skin under a microscope. She could see the flat cells that made the piece of skin.

• Plants perform photosynthesis to make sugars that they can then break down for energy.

• Joy has been playing basketball in the heat all day. By the time he walks home, his shirt is covered in cold sweat.

• Baby frogs don't look like adult frogs. Instead, they are small tadpoles that swim in the water. Eventually, they will grow up and change into a frog like their mom.

Joshua went to the museum and stood next to a replica of a caveman. Josh noticed that although they look very similar, he doesn't have anywhere near as much body hair as the museum statue does.

• Living things change as individuals

• Living things change as species

• Living things are made of cells

• Living things reproduce

You create an experiment to test how far you can run in 10 minutes in different temperatures. One day you ran in 90*F heat, another day you ran when it was 70*F, and another day you ran in 50*F weather. What is one of our constants?

• time spent running

• outdoor temperature

• distance ran

• body temperature

You are doing research. You find an experiment titled "The Effects of Age on Amount of Sleep Required by the Brain." What is the Dependent Variable?

• there isn't one

• amount of sleep required by the brain

• age

Metabolism

• a particular type of living things that can reproduce by interbreeding among themselves

• the chemical processes that build up or break down materials

• the variety of life

• any individual living thing