The initial mass of a radioisotope is 10. 0 g. If the radioisotope has a half-life of 2. 75 years, how much remains after four half-lives?.

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Pls! plant cells and animal cells were observed under a microscope. the characteristics of two cells are listed below. cell p: does not capture sunlight cell q: has cytoplasm but no chloroplast which statement about the two cells is correct? cell q also has a cell wall. cell q also has large vacuole. cell p also has a large vacuole. cell p also has a cell membrane.

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base