00:01
Hello students.
00:03
The first question says a few birds such as ostriches have wings but cannot fly.
00:10
Which of the following best explain this.
00:12
Option a, when reptiles evolved into birds, some birds develop wings for flight but other developed wings incapable of flight.
00:22
Option b, ostriches involved first then all other flying birds evolved from ostriches.
00:29
Option c, ostriches are not true birds.
00:33
And option d, ostriches evolved from a bird ancestors that flew.
00:39
So for this question, the right option is ostriches evolved from a bird means option d.
00:50
Ostriches, ostriches evolved from a bird ancestor from a bird ancestor that flew, ancestor, that flew, that flew is the correct option.
01:15
Because birds such as ostriches, birds such as ostriches, emus, and kiwis, and, and kiwis cannot fly as there, cannot fly as they are flat brazed bones like the keel that lack the keel that that anchors the strong pictorial the strong pictorial the strong pictorial and pectoral muscles required muscles required for flight.
02:32
These birds are called flightless birds.
02:35
These birds are called flightless birds, which have lost the ability to fly, which have lost the ability to fly, which have lost the ability of sorry ability to fly in the course of evolution in the course of evolution evolution now the ancestor of the ostrich was in fact a flying bird the the ancestor the ancestor of the ancestor of the ostrich of the of the ostrich was in fact a flying bird, in fact a flying bird...