Alist of environmental issues is shown below.
• rabbits transported from europe overrun and
deplete farmlands in australia.
• many areas in the southeastern united states
are overgrown with the kudzu plant from asia.
• in parts of new york state, bluebirds must
compete with starlings originally brought here
from england.
all of these issues are the result of
(1) introduction of nonnative species into stable
ecosystems
(2) genetic engineering without using adequate
safety precautions
(3) preservation of habitats due to human
population growth
(4) use of foreign species to replace native
predators

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.