Section 1
What is the difference between an internal and an external stimulus?
All living organisms are made up of these basic units.
cells
A baby grows larger and replaces old cells. Which characteristic of life does this demonstrate?
growth and development
external and internal
An organism made of only one cell is called this.
unicellular
An organism made of many cells is called this.
multicellular
This is the process of grouping organisms based on shared characteristics.
classification
This instrument provides a magnified image of small structures and samples.
light microscope
This characteristic means that an organism can produce offspring.
reproduction
A dog eats food to move, grow, repair cells, and respond to its surroundings. Which characteristic does this demonstrate?
use of energy
Name two reasons why classification is useful.
This characteristic allows an organism to detect and react to changes in its environment.
response to stimuli
Put these levels of organization in order from simplest to most complex: organ, organism, tissue, cell, organ system.
Cell → Tissue → Organ → Organ system → Organism?
This tool uses a series of questions with yes-or-no answers to identify organisms.
dichotomous key
A plant bends toward sunlight. Which characteristic of life does this demonstrate?
response to stimuli
Mention the kingdoms that belong to the eukarya domain
protista, fungi, animalia, plantae
A person sweats when the weather is hot. Which characteristic of life does this demonstrate?
homeostasis
name the two types of reproduction in living things and an example of a species that uses each of them
sexual - humans
asexual - bacteria
A group of similar cells working together forms this level of organization.
tissue
This process allows an organism to keep its internal environment stable even when external conditions change.
homeostasis
Name at least five characteristics that scientists use to identify living things.
Explain why organization is important to living organisms.
Organization allows each part of an organism to perform a special job. Cells form tissues, tissues form organs, and organs work together in organ systems to help the organism function efficiently, grow, respond to its environment, and stay healthy.
A tree is alive, a rock is non-living, and a dead animal once showed the characteristics of life. Explain the difference among these three examples.
list the 5 kingdoms of life
Bacteria, archea, protista, fungi, animalia, plantae
List the 3 domains in which living things are classified
bacteria, archea, eukarya