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How are homologous evidence for evolution?
Homologous structures are evidence for evolution because they indicate that different species share a common evolutionary ancestor. These structures have similar underlying anatomical or genetic features, suggesting a shared evolutionary history. For example, the bones in the limbs of vertebrates all share a common anatomical structure, indicating a shared evolutionary origin.
What term refers to the arms and legs?
They can be called limbs, appendages, extremities, or members.
Which evolutionary innovation was most significant in helping tetrapods move to dry terrestrial environments?
The evolution of limbs with digits was the most significant innovation that helped tetrapods move onto dry terrestrial environments. This adaptation allowed for weight support, better mobility, and the ability to navigate various terrains.
Do lizards have 4 limbs?
Yes, lizards typically have four limbs.
Why are the bones of the lower limbs larger and heavier than upper limbs?
The bones of the lower limbs are larger and heavier than the bones of the upper limbs because they must support the body's weight and provide stability during activities like walking, running, and jumping. The lower limbs also have larger muscle groups attached to them, which contribute to their increased size and strength compared to the upper limbs.
Species that share a common ancestors have?
Species that share a common ancestor have similarities in their genetic makeup, anatomy, and evolutionary history. These shared traits provide evidence of their relatedness and the branching points in their evolutionary tree.
A few characteristics of the koala are listed below Segmented body Jaws limbs and hair No placenta used during reproduction Where does the koala belong in the cladogram shown below?
F - Hair
A few characteristics of the turtle are listed below Segmented body Jaws and limbs No hair No placenta used during reproduction Where does the turtle belong in the cladogram shown below?
E, limbs (apex)
What are the four animals that have homologous limbs?
The four animals that exhibit homologous limbs are humans, whales, bats, and cats. Despite their different functions—manipulation, swimming, flying, and walking—the underlying skeletal structure of their limbs is similar, reflecting a common evolutionary ancestor. This similarity highlights the concept of evolution and adaptive radiation, where species evolve distinct traits while retaining fundamental anatomical features.
Are the whales femur and pelvis acquired traits?
The femur and pelvis of whales are considered vestigial structures, meaning they are remnants of evolutionary ancestors that had functional limbs. While these bones are present in modern whales, they do not serve a purpose for locomotion, as whales have adapted to an aquatic lifestyle. Therefore, while the presence of these bones is inherited from their ancestors, their reduced size and function can be seen as a result of evolutionary change rather than acquired traits.
Jointed limbs are an important evolutionary development because they allow animals to?
Jointed limbs are an important evolutionary development because they allow animals to have a wider range of motion and increased flexibility in movement. This can help with activities such as hunting, escaping predators, and mating. Jointed limbs also enable animals to adapt to various environments and perform specialized tasks.
How many fins does a Bull shark have?
All 6. pectoral, pelvic, caudal, anal, 1st dorsal fin, and 2nd dorsal fin.
Are the functions of the limbs of each animals illustrated the same or different?
The functions of limbs in animals can vary depending on their evolutionary adaptation and environmental niche. Some animals may use their limbs for modes of locomotion, such as walking, running, or swimming, while others may use them for grasping, climbing, or digging. Overall, the functions of limbs in different animals are diverse and tailored to their specific needs.
What are some common traits of the earliest whale ancestors?
The earliest whale ancestors, known as cetaceans, exhibited several common traits that link them to land-dwelling mammals. They had elongated bodies, limbs modified into flippers, and nostrils positioned on the top of their heads, which facilitated breathing while swimming. Additionally, they retained some characteristics of terrestrial mammals, such as a robust skeletal structure and a hip structure that indicated they were still somewhat adapted to land. These traits highlight their evolutionary transition from land to an aquatic lifestyle.
What typical whale-like traits were apparently the earliest to appear What apparently evolved much later?
The earliest whale-like traits, seen in ancient cetaceans like Pakicetus, included adaptations for a semi-aquatic lifestyle, such as elongated limbs and a body shape conducive to swimming. These early whales also had features like a basic form of echolocation and a streamlined skull. Later evolutionary developments included more specialized traits for fully aquatic living, such as the loss of hind limbs, the evolution of flippers, and advanced echolocation capabilities seen in modern species like dolphins and sperm whales. Additionally, the development of a more pronounced dorsal fin and tail flukes occurred much later in whale evolution.
Are the functions of the limbs of each of the animals illustrated the same or different?
The functions of the limbs in different animals can vary significantly based on their ecological niches and evolutionary adaptations. For instance, the limbs of a bird are adapted for flight, while those of a whale are modified for swimming. In contrast, the limbs of a primate are structured for climbing and grasping. Thus, while some functions may overlap, such as locomotion, the specific adaptations reflect the different lifestyles of each species.
Why is coelacanth called old four legs?
The coelacanth is often referred to as "old four legs" due to its unique evolutionary history and its physical features. This ancient fish, which was thought to be extinct for about 66 million years until its rediscovery in 1938, possesses lobed pectoral and pelvic fins that resemble limbs, suggesting a close evolutionary relationship to the ancestors of terrestrial vertebrates. The term highlights its significance in understanding the transition from water to land in vertebrate evolution.
