What features of ancient aquatic organisms made it possible for them to leave the sea and colonize the dry land about 400 million years ago ?

Algae began to grow and their desendent made it possible for them to grow.

Check these sites.

http://www.brightsurf.com/news/headlines/29966/Ancient_amphibians_evolved_a_bite_before_migrating_to_dry_land.html

http://www.nature.com/news/2006/060403/full/060403-7.html

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what features of ancient aquatic organisms made it possible for them to leave the sea and colonize the dry land about 400 million years ago.

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The transition from aquatic organisms to land-dwelling organisms, known as the colonization of the dry land, was a significant event in evolutionary history. To understand the features that made this transition possible, we need to examine some key adaptations that ancient aquatic organisms developed:

1. Lungs: One of the most crucial developments was the evolution of lungs or lung-like structures. These structures allowed organisms to extract oxygen from the air rather than relying solely on extracting dissolved oxygen from the water. Primitive lungs evolved from swim bladders, a gas-filled structure that helped fish control buoyancy in water.

2. Muscular Appendages: Some ancient aquatic organisms developed muscular appendages, such as fins or limbs. Over time, fins transformed into limbs with digits, allowing the organisms to support their weight and move effectively on land. These limbs provided a means to adapt to various terrestrial environments and perform locomotion.

3. Scales into Skin: Another critical adaptation was the transition from scales to skin. The skin of ancient aquatic organisms evolved to be more resistant to desiccation and provide protection against excessive water loss on land. It became less permeable to water, making them better suited to survive in a drier environment.

4. Reproduction: Some ancient aquatic organisms developed adaptations for reproduction in a terrestrial environment. For instance, the evolution of amniotic eggs protected embryos from drying out by enclosing them in a fluid-filled sac (amnion), providing an environment independent of water for development.

5. Enhanced Sensory Organs: Sensory organs, such as eyes and ears, underwent adaptations to function efficiently in air rather than water. This allowed organisms to perceive their surroundings, detect predators or prey, and navigate their terrestrial environment.

It's important to note that these adaptations did not occur instantly but gradually over millions of years through natural selection and genetic changes. The transition from ocean to land was a complex process involving multiple adaptations and ecological pressures. Studying the fossil record and evolutionary biology helps scientists understand the specific changes that led to terrestrial colonization.