three domains , archae- 1st appeared, prokaria- not closed by nucleus and eukaria closed by nucleus
Answer:These contractile elements are virtually identical to skeletal muscle. ... (a) Cardiac muscle cells have myofibrils composed of myofilaments arranged in sarcomeres, ... The refractory period is very long to prevent the possibility of tetany, a ... At this point, the calcium ion channels close and K+ channels open, allowing outflux ..
Explanation:
A. "In the distant future, we're all going to be crushed"
Explanation -
Oscillating Universe Theory combines the big bang theory and the big crunch theory. This theory states that the Universe does not have any end and it would undergo various epochs during this process.
It mentions that the Universe expands and contract where it becomes small and dense and will lead to a new beginning that will have a different property than the old universe. Some day, the universe is going to shrink and crush.
Answer:
B
Explanation:
A zygote is the resulting cell from fertilization.
Fertilization occurs when the sperm (the male gamete/sex cell) fuses with the egg (the female gamete/sex cell). After they fuse, or fertilize, a cell forms that contains half of the DNA from the father (sperm) and the other half from the mother (egg). It has a complete set of DNA, and is considered a haploid cell.
It is not the structure that nourishes the fetus, an un-fertilized egg, or a ball of about 100 cells. Therefore, the correct answer is <u>B: a sperm fused with an egg.</u>
