Answer:
Nuclear fusion.
Explanation:
A protostar forms as mass increases. Nuclear fusion begins under high pressure.
Algae grow when they have the right conditions such as adequate nutrients (mostly phosphorus but nitrogen is important too), light levels, pH, temperature, etc. Generally the amount of phosphorus controls the amount of algae found in a freshwater lake or water body. The more nutrient-enriched a lake is, typically the more algae in the lake.
Out of the choices given, the step that caused an aerobic atmosphere during the history of Earth was the origin of photosynthetic prokaryotes. The correct answer will be D.
Answer:
An introduced species is a non native species that has one way or another been integrated into the native environment by human or other means. The key difference with introduced species are that they integrate into the native environment without negative effects to the surrounding ecosystem.
Explanation:
Answer: a. Haploid spores are released to form zygotes, which grow into gametophytes.
A fern has two different stages of the life cycle; the sporophyte and gametophyte. In the sporophyte, spores are released. After this life cycle comes the gametophyte or the sexual phase, <span>haploid spores are released to form zygotes, which grow into gametophytes. </span>
