The table below shows the fossils of organisms found in various layers of an undisturbed rock: Fossils In Rock Layers Layer (from top) Fossil in Layer 1 X, W 2 W 3 Z 4 Y, U Which statement about the organisms whose fossils are found in the rock is correct? Organism W existed much before Organism Y. Organism Y existed over the longest period of time. Organism Y and Organism U were alive over the same time span. Organism W existed over a shorter period of time than did Organism X.

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answer///multiple alleles;

b. climate change will cause an increase in biodiversity of all ecosystems.

hope this

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy