Question

Scientists discovered that the Albert's squirrels became two separate populations during the Grand Canyon's formation; they are now known as the Albert's and Kaibab squirrels.

Their traits differ, and scientists agree that in the future they may no longer be able to breed with each other.

If this occurs and breeding can not happen, what will this be an example of?

A.
natural selection

B.
speciation

C.
spontaneous generation

D.
succession

Answer 1

Which is an example of a population?

A.
one of the trees in a forest

B.
all the gray squirrels that live in a forest

C.
each individual in a herd of bison

D.
all the individuals that make up a species

Scientists discovered that the Albert's squirrels became two separate populations during the Grand Canyon's formation; they are now known as the Albert's and Kaibab squirrels.

Their traits differ, and scientists agree that in the future they may no longer be able to breed with each other.

If this occurs and breeding can not happen, what will this be an example of?

A.
natural selection

B.
speciation

C.
spontaneous generation

D.
succession

Which process can lead to speciation?

A.
Over time two populations may differ in their diet and behavioral adaptations but can still mate and produce offspring.

B.
Two populations become reproductively isolate; no inter-mating occurs.

C.
Over time populations may differ only in coat color or limb length.

D.
Over time two populations will occasionally interbreed.

What is Charles Darwin's major contribution to science?

A.
He explained how species evolve.

B.
He performed an experiment showing how molecular compounds first formed.

C.
He showed DNA is passed from parents to offspring.

D.
He categorized thousands of species to compare their different traits.

Which supports the hypothesis that life has changed over time?

A.
The length of a giraffe's neck is longer than those in generations of the past.

B.
Organisms differ from each other around the world.

C.
The atmosphere from today and years ago is different.

D.
Prokaryotic and eukaryotic cells differ in that both do not have a nucleus.

What was the difference between Darwin and Lamarck?

A.
The idea of mutations was understood by both, but Lamarck was able to prove it.

B.
Darwin was able to explain evolution with evidence, something Lamarck did not do.

C.
The idea of mutations was understood by both, but Darwin was able to prove it.

D.
Lamarck was able to explain evolution with evidence, something Darwin did not do.

Which organisms are the oldest to most recent, based on scientific views?

A.
cyanobacteria, birds, sea scorpion, saber-toothed cats

B.
birds, saber-toothed cats, sea scorpion, cyanobacteria

C.
cyanobacteria. sea scorpion, saber-toothed cats, birds

D.
cyanobacteria, sea scorpion, birds, saber-toothed cats

How did Stanley Miller’s experiment in 1953 influence scientific thinking about the origin of life?

A.
It showed that radiometric dating could be used to accurately determine the age of fossils.

B.
It proved that the atmosphere of the early earth contained ammonia and methane.

C.
It proved that organisms could evolve by the process of natural selection.

D.
It showed that the chemicals of life could form in the conditions found on the early earth.

What gas was present in earth's earliest atmosphere and used by cyanobacteria during photosynthesis?

A.
oxygen

B.
carbon dioxide

C.
nitrogen

D.
methane

Which organism was the first to develop in the absence of oxygen?

A.
algae

B.
cyanobacteria

C.
prokaryotic

D.
eukaryotic

What is the name given to the images embedded in these rocks?



A.
petrified wood

B.
fossils

C.
amber

D.
drawings picture in the drop file

Certain types of atoms break down at a known rate. Scientists can measure the amounts of the broken down products present in a sample to calculate its age.

What is this technique called?

A.
speciation

B.
the fossil record

C.
radiometric dating

D.
natural selection

Fossils allow scientists to determine when and for how long a certain species lived.

What can scientists deduce from this discovery?

A.
earth's life has changed over time

B.
which fossils are heavier

C.
the food sources that were available

D.
explain how earth remained unchanged

According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere.

Which statements explain how this change occurred and how it affected life on earth?

Choose all answers that are correct.

A.
Oxygen is needed to carry out photosynthesis. When cyanobacteria evolved, they began to carry out photosynthesis.

B.
Adding oxygen to earth's atmosphere allowed for the development of prokaryotic organisms, which need oxygen to carry out many of their life processes.

C.
Adding oxygen to earth's atmosphere allowed for the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.

D.
Oxygen is a product of photosynthesis. When cyanobacteria evolved, they began to carry out photosynthesis.