The greatest cause of the worldwide loss of species is human activity. I think
Answer:
Crossing over is responsible for genetic variation of an organism.
Explanation:
Crossing over between two homologous chromosomes of non-sister chromatids is responsible for the genetic variation in an organism because in crossing over the segments of one chromatids are exchanged with one another which is different from one another. Due to difference in the segments of two chromatids, the difference occurs in the genetic makeup as well as in the physical structure and appearance of that organisms.
Answer: modified soil horizons
Explanation: parent material are by definition unmodified. Soil is not a component of atmosphere; geographic earth materials are not atmosphere. A nurtured dominant structure is not a geographic term.
Before cell reproduction or mitosis can proceed, the correct sequence of steps that must first occur is the following one: growth, chromosome replication, repair of chromosomal errors, and duplication of cell organelles. This is the right order in which these steps should happen before the cell is to reproduce or split itself into several parts during mitosis.