According to astronomers, the big bang occurred approximately 14 billion years ago.

a. true

b. false

1. Biotic factors like wolves can have an effect on abiotic factors like rivers. True or False 2. Energy can not be transferred from one trophic level to the next. True or False 3. Extirpation is when a species disappears from a part of its range.

What is the first mammal to walk on earth?

What organ grinds food? 1: air capillaries 2: alveoli 3: barb 4: barbule 5: coracoid 6: crop 7: farcula 8: gizzard

How does binary fission in prokaryotes differ from mitosis and cytokinesis in eukaryotes?

Which process requires the sperm and egg cell

3. How big is the Clark Refractor in Arizona?

Radioactive uranium-235 has a half-life of 704 million years. If it was incorporated into dinosaur bones, could it be used to date the dinosaur fossils?

hurricanes can damage or destroy barrier islands. suppose a barrier island that separates an estuary from the ocean was damaged by a storm: how would this affect the estuary

A cell with a chromosome number of four undergoes meiosis what is the result

How does acid precipitation cause chemical weathering?