Which traits do not correlate strongly with diversification rate within phyla, but are likely to have been important in the original diversification of animal phyla during the Cambrian? Select True or False for each trait. T/F presence of a head T/F mobile lifestyle T/F terrestrial lifestyle T/F bilateral symmetry

Verified step by step guidance

1. Step 1: The question is asking us to determine which traits do not strongly correlate with diversification rate within phyla, but were likely important in the original diversification of animal phyla during the Cambrian period. The traits given are: presence of a head, mobile lifestyle, terrestrial lifestyle, and bilateral symmetry.
2. Step 2: The presence of a head is a trait that does not strongly correlate with diversification rate within phyla. This is because many successful animal groups (like insects and mollusks) do not have a distinct head. However, it was likely important in the original diversification of animal phyla during the Cambrian period, as it allows for more specialized feeding and sensory structures. So, the answer for this trait is True.
3. Step 3: A mobile lifestyle is a trait that does not strongly correlate with diversification rate within phyla. This is because both mobile and sessile (non-moving) organisms can be highly diverse. However, it was likely important in the original diversification of animal phyla during the Cambrian period, as it allows for exploration of new environments and escape from predators. So, the answer for this trait is True.
4. Step 4: A terrestrial lifestyle is a trait that does not strongly correlate with diversification rate within phyla. This is because many highly diverse groups of animals are aquatic. However, it was not likely important in the original diversification of animal phyla during the Cambrian period, as this was a time when life was predominantly aquatic. So, the answer for this trait is False.
5. Step 5: Bilateral symmetry is a trait that does not strongly correlate with diversification rate within phyla. This is because many successful and diverse animal groups (like cnidarians and echinoderms) do not have bilateral symmetry. However, it was likely important in the original diversification of animal phyla during the Cambrian period, as it allows for more efficient movement and a streamlined body shape. So, the answer for this trait is True.

Key Concepts

Diversification Rate

Diversification rate refers to the rate at which new species are formed and existing species go extinct within a particular group, such as animal phyla. It is influenced by various factors, including environmental changes, ecological interactions, and evolutionary innovations. Understanding how certain traits impact diversification can help explain patterns of biodiversity observed in the fossil record and current ecosystems.

Cambrian Explosion

The Cambrian Explosion was a significant evolutionary event that occurred around 541 million years ago, marked by a rapid increase in the diversity of life forms, particularly in marine environments. This period saw the emergence of many major animal phyla and the development of complex body plans. Traits that contributed to this diversification, such as mobility and the presence of a head, played crucial roles in the survival and adaptation of early animals.

Key Morphological Traits

Key morphological traits, such as bilateral symmetry, the presence of a head, and lifestyle adaptations (e.g., mobile or terrestrial), are critical for understanding the evolutionary pathways of organisms. These traits can influence an organism's ecological niche, reproductive strategies, and interactions with other species. While some traits may not correlate strongly with diversification rates, they can still be pivotal in the initial phases of evolutionary development and adaptation.