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No, after the alpha decay of polonium lead isotopes were obtained.

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What in a cell are tunnels for protein export?

Tunnels for protein export in a cell are known as nuclear pores. These are large protein complexes that span the nuclear envelope and facilitate the transport of molecules like proteins and RNA between the nucleus and the cytoplasm. Nuclear pores are crucial for regulating cellular processes and maintaining cell function.


Are there tunnels from pyramids to center of earth?

No, there are no tunnels from pyramids to the center of the Earth. Such claims are purely speculative and not supported by any scientific evidence. Pyramids were built for various purposes such as tombs or religious monuments, not for connecting to the Earth's core.


What is the type of rock fragment that contains holes and tunnels left by escaping gases called?

The type of rock fragment that contains holes and tunnels left by escaping gases is called a vesicular rock. These holes and tunnels are known as vesicles, and they form when gas bubbles are trapped in magma during solidification. Examples of vesicular rocks include pumice and scoria.


What do you think the tunnels and holes in a sea sponge are for?

I don't know for sure, but since you asked for an opinion... I have two theories. 1. The tunnels and holes are there to allow for the absorption of more oxygen from the water around it. 2. The tunnels and holes are there to provide shelter for smaller organisms that form a symbiotic relationship with the sea sponge.


What happens to dirt from mole tunnels?

Blown around and compacted are what happens to dirt from mole tunnels. The mammal in question (Talpidae family) compresses some of the dirt to form non-collapsible tunnels underground and ejects the rest out the entryway (for compaction in place or movement by people, rain, wildlife, and wind.