Question

phenomenon activity
evidence in the fossil record
i can...

• explain how fossil evidence can show that a living organism is closely related to an earlier organism.

vocabulary
embryo evidence extinct fossil record homologous structures
phenomenon how can a fossil provide evidence that manatees and elephants are distant cousins?
image of manatee and elephant
make a claim investigate the photos and explain how you could use fossils to show that manatees and elephants are related.

engage diversity and evolution of living organisms: evidence in the fossil record
with a partner, take turns evaluat
author provided support for her claims? use reaso

Explanation:

To show manatees and elephants are related using fossils, we can: 1. Examine fossilized skeletal structures (like limb bones) for homologous structures, indicating a common ancestor. 2. Analyze the fossil record for transitional species with features intermediate between manatees and elephants, showing evolutionary links. 3. Compare fossilized embryos (if available) for similar developmental patterns, a sign of shared ancestry. Fossils with structural similarities or transitional forms suggest they evolved from a common ancestor, making them "distant cousins."

Answer:

To determine if manatees and elephants are related, we analyze fossils:

1. Homologous Structures: Examine fossilized bones (e.g., limb or skull bones) for similarities in structure (homologous structures). If manatee and elephant fossils share structural patterns (e.g., similar bone arrangements in limbs), this suggests a common ancestor.

1. Transitional Fossils: Look for fossilized species with features intermediate between manatees and elephants (e.g., fossils with a mix of aquatic-adapted traits like manatees and terrestrial/elephant - like skeletal features). These transitional forms show evolutionary links over time.

1. Fossil Record Timeline: Compare the age and geographic distribution of manatee and elephant - related fossils. If their fossil lineages overlap in time/region (or show sequential evolution from a shared ancestral group), it supports a common origin.

In short, fossils with shared structural traits, transitional forms, or overlapping evolutionary timelines provide evidence that manatees and elephants evolved from a common ancestor (making them distant cousins).