A sample of a radioactive element has a mass of 80 g. How much daughter materials are in the sample after two half-lives?

Find and describe the climate zone in which you live, where else in the world do you find this climate zone? do you have any ideas about why the climates might be similar?

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.