Answer:
d.The wing-assisted incline running theory postulates that wings were initially used to maintain balance while climbing up slopes.
Explanation:
Two theories were given to explain the origin of avian flight. The top-down theory suggested that the birds' ancestors were tree dwelling species. They took help of wings to glide from tree to tree in order to avoid predator or catch prey. The bottom up theory suggested that the birds' ancestors were ground dwelling species. They took help of wings to maintain a balance and provide a lift for efficient running.
Wing-assisted incline running was a mixture of both the above theories and gave a balanced view point. According to it, birds' ancestors used wings to maintain a balance while running up inclined slopes. The wings helped them to save energy while scaling slopes and eventually a flight mechanism was also developed.
The answer to this is letter A) mitochondria. Mitochondria is an organelle that is bounded or wrapped in a double membrane. These membranes or <span>phospholipid bilayer </span>contains embedded proteins. The outer layer is characterized to be smooth while the inner layer has cristae. These cristaes are the folds.
Answer:
1 is b
2 is c
3 is either b or c
i don't really remember 4, sorry
Explanation:
Answer:
An index fossil is a fossil used to determine the age of the sediments in which it is found. When quickly approximating the age of new finds, an archaeologist looks at the rocks in which it is buried, as those sediments would have been on the surface at the time of the death of the pre-historic creature.
hope this helps
<span>Most protist diseases in humans are caused by protozoa. Protozoa make humans sick when they become human parasites.<span>Trypanosoma protozoa cause Chagas disease and sleeping sickness.</span></span>
