Which of the following accurately describes the life cycle of most gymnosperms?
a. seed cones contain ovules.
b. germinated seeds are haploid.
c. a pollen tube is used to prevent the fertilization process.
d. pollen grains undergo meiosis to form egg cells.

Answer;

A. Seed cones contain ovules.

Explanation;

-The gymnosperms are a group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes. They do not have an outer covering or shell around their seeds, they do not produce flowers and also they do not produce fruits.

-In the life cycle of gymnosperms, the gametophyte generation takes place in a cone, which forms on the mature sporophyte plant. Each male gametophyte is just a few cells inside a grain of pollen. Each female gametophyte produces an egg inside an ovule.

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:

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .