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Not actually. There were several different marine reptiles that had mammalian characteristics, notably the group known as pelycosaurs. The earliest mammals appeared early in the Age of Reptiles (Mesozoic Era), but were uniformly small in size. The group called synapsids took an evolutionary path to mammals while the sauropsids became today's reptiles and birds.
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What are the kingdom schemes and examples of each?
The three main kingdom schemes are Monophyletic (includes all descendants from a common ancestor, like Mammals), Paraphyletic (includes the common ancestor but not all descendants, like Reptiles), and Polyphyletic (does not include the common ancestor, like Invertebrates). Each scheme groups organisms based on evolutionary relationships.
Are fish monophyletic?
No, fish are not monophyletic. The term "fish" is a paraphyletic group because it includes some but not all descendants of a common ancestor. It does not include tetrapods (four-limbed vertebrates such as amphibians, reptiles, birds, and mammals) which share a more recent common ancestor with some fish species.
Is a hippo an ancestor of the whale?
Yes, hippos and whales share a common ancestor but are not direct ancestors of each other. They both belong to the same group of mammals called Cetartiodactyla. However, whales evolved from a different branch within this group than hippos did.
What does monophyletic group consist of?
A group of species that consists of a common ancestor and all of its descendants (also referred to as a clade).
When classifying organisms a monophyletic group includes?
A group of species that consists of a common ancestor and all of its descendants (also referred to as a clade).
What fact implies that Nearly all mammals have seven cervical neck vertebrae?
all mammals descended from a common ancestor.
Nearly all mammals have seven cervicals what does this fact imply?
They are all descended from a common ancestor.
What are the similarities of human and chicken embryo?
Mammals, birds, and reptiles all derive from a single common ancestor.
Do birds and mammals inherit intelligence from a common ancestor?
yes
What type of mammals are closely related to reptiles?
All mammals evolved from a common ancestor, which was the very first mammal. That very first mammal had evolved from reptiles. As such, all mammals are equally related to reptiles.
Do humans and bats have a common ancestor?
Yes, humans and bats share a common ancestor. Both humans and bats belong to the group of mammals, which evolved from a common ancestor millions of years ago.
What evidence suggests that humans and bats have a common ancestor?
For one, both humans and bats are in the class Mamalia, which is reason enough to suggest that they come from a common ancestor. The modern classification system, developed by Linnaeus, and modified by scientists such as Darwin and Lyell, is based of common ancestors. So, all mammals come from a common ancestor. How do we know this? Well, all mammals share a peculiar trait: All mammals are completely indistinguishable at the pre embryonic stage. This proves that bats and humans come from common ancestry.
The mammal trait of having fur is an example of a derived character because?
A synapomorphic (derived) character is defined as a trait that multiple taxa and their last common ancestor possess, but that the ancestor of this last common ancestor did not possess. The multiple taxa in this case could be the 29 orders of mammals, all of which have fur. All mammals descend from cynodonts. It is probable that cynodonts were covered in fur. Cynodonts evolved (with various steps in between) from early amniotes, which did not have fur. We do not know when exactly fur appeared in the evolution of mammals.
Where do people evolve from?
Humans and all other primates share a common mammalian ancestor from millions of years ago, a possum-like tree mammals. Mammals diversified to adapt to the different conditions they were faced with, becoming all the groups of mammals we see today.
What does the FOXP2 gene in mammals tell us about evolutionary relationships?
That those organisms that posses this gene have the same common ancestor that they all branched from and developed from.
What are the kingdom schemes and examples of each?
The three main kingdom schemes are Monophyletic (includes all descendants from a common ancestor, like Mammals), Paraphyletic (includes the common ancestor but not all descendants, like Reptiles), and Polyphyletic (does not include the common ancestor, like Invertebrates). Each scheme groups organisms based on evolutionary relationships.
What is the common ancestor that a human and porpoise may have?
It's been estimated that 75% of mammals are now extinct, so it's unlikely that a common ancestor still exists as a modern species. However, if we saw a common ancestor we'd probably say it looked like a shrew.
