Some animals, like birds, reproduce by fusion of cells. Before a bird hatches, what protects the bird as it develops?

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Answer 1
Answer: A shell protects the bird.

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toucans eat fruits that grow high in trees.What feature of the toucan's body structure might be an adaptation? Explain

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their wings because they have to fly

How is diffusion related to smelling the odor of a skunk that is far away

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Diffusion is the idea that when a solute enters an area with a lower concentration than the solute, it will mix into the area. So the skunk odor has a higher solute concentration then the atmosphere it's released into, so when it is released it will diffuse across a wider area in order to try and level out the level of concentration. This means it can be smelt from further away. 

list three biotic and three abiotic factors that determine the survival of a rabbit in a temperate forest

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Little Bear's porridge in the Goldilocks tale, abiotic elements must be just right for life to grow.

Thus, Many creatures also need a certain collection of abiotic elements in order to flourish. a snake residing in the arid region of Arizona. It can move through sand and loose soil by twisting its body, therefore it is at home in that dry environment.

Additionally, it can escape the heat by slipping under rocks.

Some snakes are also nocturnal, meaning they spend the most of the day sleeping and doing their activities at night when the sun is not out.  a person picking up one of these snakes with desert adaptations and setting it atop a snow-capped Himalayan summit.

Thus, Little Bear's porridge in the Goldilocks tale, abiotic elements must be just right for life to grow.

Learn more about Life, refer to the link:

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Biotic factors may include: plants the rabbit eats, predators that eat the rabbit, and animals that compete with the rabbit for food and territory. Abiotic factors may include: temperature, rainfall, and space.

What's the scientific name of a flathead bullhead catfish?

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It is called "Ameiurus".

Explain how do groundwater erosion and deposition produce a limestone cave

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due to the moisture and stabilitty the the matter in it can be produced.

Why do all swordfish have ‘swords’? Use the word ‘inherited’ in your answer.

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All swordfish have 'swords' because it is a characteristic inherited trait  from their parents.

Inherited traits are passed down from one generation to the next generation through genes. In the case of swordfish, the sword-like bill which is present  is a unique adaptation  that has been passed down through generations. This bill is believed to have evolved to help the swordfish in catching prey, defending themselves, and  also in attracting mates.

The swordfish that had longer bills were more successful in survival and reproduction, which is  the reason why this trait has been preserved and is   observed in all swordfish today.The traits that  are transmitted by the parent to its offspring during the process of fertilization are inherited traits. This inheritance is determined by certain rules of heredity.

Thus, all swordfish have sword as they are inherited traits.

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The swordfish bill, on the other hand, is smooth and horizontally flattened, better suited perhaps for whacking larger prey like squid. Beyond their "swords," all billfish come equipped with a remarkable internal heating system for their eyes, keeping them ten to fifteen degrees Celsius warmer than ambient water temperatures.

sorry if it didn't help but pls brainliest? :/