Rock that is exposed to air, and especially to changing weather, tends to break down more than rock that is covered.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

Speed is the ratio of the distance of an object moves to