A) a common ancestor
Homologous structures are structures that are similar in related organisms. There is a basic pattern of bones which can be inherited from a common ancestor
As you workout your heart rate will increase because you need oxygen.
Approximately 1,000 to 30,000 years old
Animals that use echolocation. Bats, whales, dolphins, a few birds like the nocturnal oilbird and some swiftlets, some shrews and the similar tenrec from Madagascar are all known to echolocate.
Answer:
: A decrease in pH is too acidic compared to optimum pH for amylase activity.