Question

(17) How do X and Y chromosomes differ?
?
(18) far what purpose is the study of fossil important?
(19) write the full name of DNA
(20) How is the device measuring electate curgent
connected in the circuit?
(21) Rame two oxides that cause and sain.
[?]
coal and
(22) Define ecosystem.
(23) Name the main contituents of
petrolium ?
(24) In which body part of human pituatary gland
situated; what is the function of it.​

Answer 1

Answer:

1: x chromosome have 1000 genes and Y chromosome have 78 genes

2: fossil study help in to know how and when different species are live in million of years ago

3: DNA- deoxyribonucleotide acid

4: ecosystem- all the plant and animal in a particular area consider together with the surrounding

5: main constitute of petroleum is butane and propane

6: pituitary gland is attached with the brain ( the hypothalamus) it secret the hormone directly into the blood stream