Is there evidence of selection for defensive adaptations in mollusc populations exposed to predators?
The fossil record provides evidence
that predator-prey interactions may have shaped the course of animal evolution.
What is a transitional fossil quizlet?
Transitional fossils have
features that are intermediate between ancestors and descendants
. … To become a fossil, an animal must remain buried for thousands or millions of years until it (and the layer around it) turns to rock. Many fossils remain buried.
What can you conclude about the relationship between deviation from expected brain size and mortality rate?
What can you conclude about the relationship between deviation from expected brain size and mortality rate?
Adult mortality tends to be lower in birds with unusually large brains for their body size
, suggesting that these unusually large brains confer an advantage in survival.
What is a transitional fossil mastering bio?
Transitional fossils have features that
are intermediate between ancestors and descendants
. … -Many fossils remain buried. We can only find them when they are exposed by erosion or excavation. -To become a fossil, an animal must be quickly and completely buried in ash or sediment before it has a chance to decompose.
What form of evidence suggests that animals evolved by at least 710 million years ago?
Since sponges are animals, these
“fossil steroids”
suggest that animals had arisen by 710 million years ago. DNA analyses generally agree with this fossil biochemical evidence; for example, one recent molecular clock study estimated that sponges originated about 700 million years ago.
What are two reasons common names for species can be confusing?
Give two reasons why common names of organisms can lead to confusion.
Common names can refer to many different species, sometimes the same common name can refer to very different organisms
. They don't accurately reflect the organism. Organisms also have different common names in different languages.
Hominidae
was originally the name given to the family of humans and their (extinct) close relatives, with the other great apes (that is, the orangutans, gorillas and chimpanzees) all being placed in a separate family, the Pongidae.
What is an example of a transitional fossil?
Specific examples of class-level transitions are:
tetrapods and fish, birds and dinosaurs, and mammals and “mammal-like reptiles”
. The term “missing link” has been used extensively in popular writings on human evolution to refer to a perceived gap in the hominid evolutionary record.
Why is Tiktaalik considered a transitional fossil?
So why is Tiktaalik referred to as a transitional creature? Its mix of characteristics of fish and of tetrapods suggest that
it represents one of the moments in the transition between fish and tetrapods
. them have found fossils.
What is the value of a transitional fossil quizlet?
What is the value of a transitional fossil?
Transitional forms show the evolutionary steps between species
. What do gradualism and punctuated equilibrium have in common? They are both explanations of the rate of evolutionary change.
Does brain size increase much in the australopithecines through time?
Homo sapiens brain size
increases over time
within the sapiens super-species clade (figure 2 and table 1).
What do you think were some of the immediate effects of increased brain size?
Brain size increases rapidly
Larger
, more complex brains enabled early humans of this time period to interact with each other and with their surroundings in new and different ways. As the environment became more unpredictable, bigger brains helped our ancestors survive.
Why did we develop larger brains?
Over the last million years of evolution, our brain underwent a considerable increase in size and complexity, resulting in the exceptional cognitive abilities of the human species. This brain enlargement is largely due to
an increase in the number of neurons in the cerebral cortex
, the outer part of the brain.
Is Tiktaalik a transitional fossil?
Paleontologists have uncovered new fossils from Tiktaalik roseae, which, while still a fish, is considered a transitional fossil that also has traits common to the first four-footed animals. …
What are the 4 fossil types?
There are four main types of fossils, all formed in a different way, which are conducive to preserving different types of organisms. These are
mold fossils, cast fossils, trace fossils and true form fossils
.
Which of the following is considered a transition fossil?
Archaeopteryx
: The Transitional Fossil. Paleontologists view Archaeopteryx as a transitional fossil between dinosaurs and modern birds. With its blend of avian and reptilian features, it was long viewed as the earliest known bird.
