Answer:
"Scientists are not close to knowing the exact processes that took place on the earth which led to the origins of life. They may never know the exact answer because the evidence for this very primitive life has probably been destroyed by the more efficient life which evolved from it.
Explanation:
Answer:
6.) The stroma!
7.) Wavelengths of 430nm(blue) and 662nm(red). <em>( It reflects green light strongly so it appears green to us. :) )</em>
8.) Glucose is used by plants for energy and to make other substances like cellulose and starch. <em>(Cellulose is used in building cell walls.)</em>
9.) Animals either eat plants to obtain chemical energy in the form of glucose or they eat other animals that ate plants. So, energy moves from the Sun to plants to animals. Animals also use oxygen released by the plants to breathe.
Answer:
The description is provided in the explanation section below
Explanation:
ALTERNATION OF GENERATIONS is a unique phenomenon whereby certain organisms switch between a diploid state and a haploid state in their reproductive life cycle. It is a feature of plants (higher and lower).
A plant is a diploid organism (2n) i.e. contains two set of chromosomes. This diploid state of the plant is called the SPOROPHYTE. The diploid sporophyte (2n) of a plant undergoes meiotic division (reduction division) to produce haploid spores. These haploid spores germinates and grows via mitosis (duplication division) to form the haploid GAMETOPHYTE.
The haploid gametophyte (n), via structures called GAMENTAGIA, produces haploid gametes. The male gametophyte produces male gametes (sperm) while the female gametophyte produces female gamete (egg). These haploid gametes eventually fuse in a process called FERTILIZATION to produce a diploid ZYGOTE (2n) i.e. sperm (n) + egg (n) = zygote (2n). The ZYGOTE undergoes series of mitotic divisions (growth) to form the diploid SPOROPHYTE (2n) of the plant. The cycle restarts again in that order, hence it is called ALTERNATION OF GENERATIONS.
N.B: Mitosis maintains the number of chromosomes of the parent cell while meiosis reduces the chromosomal number of the parent cell by half.
The answer is B cause earth moon and sun combined together creates the greatest gravitational pull and makes tides.
Answer:
Zygote
Explanation:
Ovum + sperm =zygote
Increased or maturing zygote is a Blastocyst
