Variation 1
Many species that lived in the past no longer exist today. We know about them because of ____________.
What is the fossil record?
An inability to adapt to environmental changes can lead to death of all members of a species. This is called _______________________.
What is extinction?
Scientists theorize that hundreds of millions of years ago, all of the continents that exist today were combined into one landmass called Pangaea. What evidence do scientists have to support this theory?
Similarities in preserved remains of ancient organisms found across different existing continents.
A group of similar cells that work together to perform a specific function is a/an _______________________.
What are tissues?
The heart is a structure that pumps blood throughout the human body. Which level of hierarchal organization best describes the heart?
What is an organ?
Describe the difference between atoms and elements.
Atoms are the single particles that together make up elements. All atoms within an element are exactly the same as each other.
Conversely, not all of today’s living species were alive in the past. Evidence of this is also found in the form of __________.
What is the fossil record?
All living things that are best adapted to their environments will be more likely to survive. This idea is known as _____________________ ____________________.
What is natural selection?
These are made of tissues and are part of an organ system.
What are organs?
A group of different tissues that work together to perform a specific function is a/an _______________________.
What is an organ?
The brain is an organ in the human body. In terms of the hierarchy of levels of organization, describe what the brain, as an organ, is made of.
What are different tissues?
These are the three types of subatomic particles, or objects that atoms are made of.
What are protons, neutrons, and electrons?
Fossils are the preserved remains of organisms that lived long ago. According to the law of ________________________, the rock layers that contain the oldest fossils should be farthest below Earth’s surface.
What is superposition?
In 1859, Charles Darwin proposed a theory based on the concept of natural selection. His theory explains the evidence of the gradual changes of all organisms over millions of years. This theory is known as the Theory of __________________.
What is evolution?
The digestive system of an earthworm consists of specialized structures such as the crop and the intestine. What level of organization best describes each of these structures?
What are organs?
A group of different organs that work together to perform a specific set of functions is a/an _______________________.
What is an organ system?
Organ systems work together to meet the needs of the human body. How is the skeletal system related to the nervous system?
The skeleton protects the brain and spinal cord.
Particles with a positive electric charge are known as _______________.
What are protons?
A __________________ is a permanent change in the genetic makeup of an organism.
What is a mutation?
Why is relative dating useful? What does it tell scientists?
It tells scientists the approximate age of specimens, compared to other known examples.
The kidneys are part of the excretory system that eliminates wastes in order to maintain homeostasis. Which substance is a waste product eliminated by the excretory system?
a) urine b) food c) water d) oxygen
What is urine?
Which level of organization is the MOST complex, based on both size and structure?
Sandy’s doctor said that she may have a disease known as Celiac disease because the nutrients from her food are not being absorbed properly. What system and organ could be causing this problem?
What are the digestive system and small intestine?
Particles with a negative electric charge are known as __________________. Those with no charge at all are called __________________.
What are electrons and neutrons?
Organisms with traits that are best suited for their environments are likely to have a greater chance for survival. These helpful traits, which arise due to genetic mutations, are known as _____________________.
What are adaptations?
How does radioactive dating help scientists? What information does it provide?
It tells scientists the exact, precise age of specimens.
The overall sequence of events that explains how organisms gradually change over long periods of time. (Hint: 4 things that need to happen, in order, ending with evolution).
Mutation, Adaptation, Natural Selection, Evolution
Which of the levels of organization are made of living cells? Name all that apply.
What are cells, tissues, organs, organ systems, and organisms?
Describe the role (or job) of organ systems, and how they fulfill that role.
Organ systems keep you alive, and they work together (interact) in order to keep you alive.
Describe how the periodic table is arranged (organized). What is an element's atomic number?
The table is a record of all known elements, arranged in order of atomic number. Atomic number is the exact number of protons in one atom of each element.