How abundant are plankton? AThe weight of all the plankton in Lake Erie would equal the weight of the Empire State Building
BIf you lined up all the Earth’s plankton end-to-end, they would stretch to the moon
CThey account for about half of all the biomass on the planet
DThere can be more than a million in a teaspoon of water

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

1. watermelon, papaya, oranges, bananas, and lemons are included in this food group. vitamin c 2. you need 6 or more servings of this food group each day vitamins d and a 3. found in fruit and keeps blood vessels healthy calcium 4. vitamins found in milk bread and grain 5. a mineral that strengthens bones fruit