Explanation:
An element is defined as a substance that consists of same number of atoms with same atomic number.
An element by any chemical means cannot be broken down into its simpler molecules or substances.
Atomic number means the number of protons present in an atom.
Therefore, every atom of the element carbon has 6 protons.
Answer:
proves
Explanation:
Answer:
Crossing-over
Explanation:
Crossing-over is a phenomenon that occurs in the Prophase stage of meiosis I. Two chromosomes of a homologous pair comes together in a process called SYNAPSIS to form a TETRAD structure. While the chromosomes synapses, breaks occur at corresponding points in the non-sister chromatids i.e in one chromatid of each chromosome. Since the chromosomes are homologous, breaks at specific points mean that the segments that are broken off contain specific genes i.e. alleles. The broken sections are then exchanged between the chromosomes to form complete new units, and each new recombined chromosome of the pair can go to a different daughter sex cell.
In meiosis, the maternal and paternal chromosomes can be shuffled into daughter cells in many different combinations. The resulting chromosomes are not entirely maternal, neither are they entirely paternal. This ensures genetic variation in sexually reproducing organisms.
Answer:
Speciation by Geographic Isolation
А
Animal cells do not contain cytoplasm because animals use lungs to conduct respiration
B
Animal cells do not contain chloroplasts because animals do not conduct photosynthesis
Animal cells do not have mitochondria because animals do not produce their own energy
D
Animal cells do not have cell membranes because animals use bone structures for support.