In order to survive in its environment, a single-celled organism uses a contractile
vacuole to remove excess water that diffuses into its cell. Another species, a hydra,
also excretes excess water. Both processes involve the use of energy.
Based on this information, state whether these two organisms live in fresh water or
salt water. Support your answer.

Asap timed! 1. ice core samples from glaciers ice caps contain bubbles of ancient atmosphere that are in layers based on age. what questions are scientists most interested in? a. how the amount of water vapor needed to make the ice has changed b. how the amount of ozone has changed over time. c. how the amount of ice in each layer has changed over time d. how the amount of carbon dioxide has changed over time 2. what produces milankovich cycles ? a. sunspots ams solar flare on the suns surface b. changes in the earths orbit c. gravitational changes bases on the position of the sun and the moond. cycles of vegetation that result in desert and rainforest conditions

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Explain how ancient whale fossils found in eqypt are believed to support the theory of evolution.