A. review what is evolution? b. apply concepts what ideas were changing in the scientific community at the time of darwin's travels? how might those new ideas have influenced darwin? 7. a. review what three kinds of variations among organisms did darwin observe during the voyage of the beagle? b. infer darwin found fossils of many organisms that did not resemble any living species. how might this finding have affected his understanding of life's diversity? apply the big idea: interdependence in nature 8. you have learned that both biotic and abiotic factors affect ecosystems. give some examples of each, and explain how biotic and abiotic factors could have affected the tortoises that darwin observed on the galápagos islands.

positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex