This tissue consists of a collection of cells surrounded by , which is composed of thread-like and which varies in consistency.

The correct terms would be - 1) extracellular matrix 2) protein fibers 3) ground substances.

Explanation:

Connective tissue is one of the four animal tissues which are made up of the different type of cells but the most common cell is fibroblast that makes both protein fiber and ground substances. These cells are surrounded by the extracellular matrix.

The ground substance is amorphous in nature and varies in the consistency and protein fibers are thread-like structure. Both cells are synthesized by the fibroblast.

Thus, the correct answer is - 1) extracellular matrix 2) protein fibers 3) ground substances.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes