The _____________________ is the longest bone in the body and is located in the upper thigh.
femur
100
The smallest unit of living things that can carry out the basic processes of life is called a _______________.
cell
100
___________________ is a green chemical in a plant cell that absorbs sunlight.
chlorophyll
100
A group of cells working together to perform a job is called a tissue. What is a group of tissues working together to perform a job called?
an organ
100
The ______________________ system works with the skeletal system to provide physical support for the body.
muscular
200
An animal with a backbone is called a __________________. An animal without a backbone is called a ________________________.
vertebrate
&
invertebrate
200
What is one major difference between a plant cell and an animal cell?
An animal cell has a cell membrane, but a plant cell has a cell wall and a cell membrane.
200
This type of plant has tubes or vessels that the plant uses to get water and nutrients from the soil.
vascular
200
Which organ has a valve that keeps acids out of the esophagus to separate its body processes?
the stomach
200
______________________ tissue relays messages between the brain and the rest of the body.
Nerve
300
The human skeleton is lightweight which causes _________________________ and ease of use.
quickness
300
The center, or brain, of the cell is called the what?
nucleus
300
This type of plant is low to the ground because it does not have tubes and vessels for water absorption.
nonvascular
300
Organs that work together to perform a certain function make up an __________________________.
organ system
300
The lungs are a part of the __________________ system.
respiratory
400
An xray would best be used to see which body system?
skeletal
400
______________________ means to have many cells.
Multicellular
400
How could a desert plant adapt its root system to its surroundings and absorb more water?
develop shallow roots that spread out over a wide area instead of long deep roots
400
Which organ pumps blood through the body?
the heart
400
The _____________ system removes waste that builds up in the body such as salt.
excretory
500
List three types of joints that are part of the skeletal system.
ball and socket
hinge
immovable
500
If scientists are looking for cells in a newly discovered object that has never been seen before, what are they trying to determine?
if the object was a living thing
500
The process in which plants use energy from the sun to create sugar for food, water taken in by roots, and create oxygen as a waste product is called what?
photosynthesis
500
The brain, spinal cord, and nerves are all part of what organ system?
the nervous system
500
The ____________________ system includes tendons and ligaments.