Asubstance is most likely to diffuse into a cell when
(1) it is a large organic food molecule such as a protein or starch
(2) it is enclosed in an organelle such as a vacuole
(3) the concentration of the substance is greater outside the cell than inside
(4) the ph of the substance is greater than the ph of the cell

The images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that . the archaeopteryx and bird have wings, while dinosaurs have limbs. so, it can be concluded that .

What are two reasons for why a species might disappear from the fossil record?

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.