What group of plants was found in the mesozoic but not in the paleozoic?

Asample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true? the rate of freezing is equal to the rate of melting. the rate of freezing is greater than the rate of melting. the amount of ice is greater than the amount of water. the amount of ice is equal to the amount of water.