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When did shells first appear?
Shells first appeared around 540 million years ago during the Cambrian period. These early shells were likely made of calcium carbonate and provided protection to early marine organisms.
What era did the first animals with both teeth and fins appear?
Silurian
When did small furry animals appear?
The first mammals appeared during the Cretaceous Period.
When did soft-bodied multi-celled animals first appear?
Late in Precambrian time
When did the first creatures with bones appear on earth?
the animals come on earth because god put them there
Are the outer electron shells always filled first?
No. The inner shells are filled first.
In what era did most types of animals first appear?
before time even started when mesopotamians were alive.
What were the first volleyballs made from?
The very first volleyball was made from toothpaste hardened.
How many years ago did animals first appear?
Animals have been around since the beginning of time. Jellyfish were one of the first living organisms that are made up of more than one cell. The first animal lived during the time of the dinosaurs, around the same time as the t-rex.
How can I safely use egg shells in my aquarium to provide calcium for my aquatic plants and animals?
To safely use egg shells in your aquarium for calcium, first clean and crush the shells into small pieces. Boil them to sterilize and remove any harmful bacteria. Let them cool before adding them to the aquarium. Monitor the water parameters regularly to ensure the calcium levels are stable and not causing any harm to the plants and animals.
Did animal appear first or did plant appear first?
Scientists believe that animals evolved from single-celled organisms in the oceans around 600 million years ago, making them the first to appear. Plants, on the other hand, evolved from ancient algae and appeared on land around 450 million years ago.
According to the fossil record how many years ago did life first seem to appear on Earth?
The Cambrian Explosion, a period between about 540 and 530 million years ago when many major animal groups appeared in the fossil record. This is when animals first developed hard shells and skeletons, so they became much more easily fossilised. Nobody is quite sure what caused the Cambrian Explosion, but increased oxygen levels in the air after the melting of a huge ice age around 600 million years ago may have led to an increase in the size of animals in the oceans; in turn they developed skeletons and shells to support their larger bodies. The evolution of predators may have inspired prey animals to develop shells, as well. We do have fossils before the Cambrian Explosion, but these are simple, soft-bodied, small and rare, so the origins of animals are still shrouded in mystery.
