Question

Which character is common to turtle, penguin, and ostrich?
(A)Not able to fly
(B)Presence of the beak
(C)Presence of the web in foot
(D)Unable to walk fast

Answer 1

Flightlessness is the characteristic of many different birds individually. Many families are there in case of flightless birds such as now extinct ones like phorusrhacidae,which evolved as the most powerful predator in case of the terrestrial ones.

Complete answer:
Turtles are reptiles which belong to the order Chelonii and are having features of the bony or cartilaginous shell. It could not be able to fly.
Penguin is a bird that would not be able to fly.
Ostrich is a bird that cannot fly.

Thus, the correct answer is not able to fly.

Additional information:
Most of the domesticated birds, some of them are the domestic chicken and domestic duck, have forgotten the capability to fly for extended periods, even though their ancestral species, the red jungle fowl and mallard, respectively, are worthy of extended flight. A few particularly bred birds, such as the Broad Breasted White turkey, due to selective breeding have become totally flightless; the birds were bred to grow massive breast meat which weighs very much for the bird's wings to withstand in flight.

Note: Flightless birds are those birds that due to evolution have lost the capability to fly. There are over 60 extant species, including the well known ratites (ostriches, emu, cassowaries, rheas, and kiwi) and penguins. The smallest flightless bird is the not capable one of the Island rail (length 12.5 cm, weight 34.7 g). The largest (both heaviest and tallest) flightless bird, which is also the largest living bird, is the ostrich (2.7 m, 156 kg). Ostriches are farmed for their decorative feathers, meat, and their skins, that are benefitted to produce leather.