Explanation:
The phase of Prophase I of meiosis is very long and divided into 5 subphases: Leptotene, Zygote, Pachytene, Diplotene, and Diakinesis. During a phase of the Diplotene, the degree of condensation is high, which allows individualizing the sister- chromatids that remain attached by the cohesins. The synaptonemal complex disintegrates, and from the centromeres begins a repulsion between homologous chromosomes, which remain associated only with the places where they occur as permutations.
These sites are called chiasmas (Greek, crossed) because they show the crossover of homologous chromatids. Chiasmas represent the cytological finding of the occurrence of permutation. The presence of at least one bivalent chiasm is essential to ensure the correct segregation of the homologous chromosomes in anaphase I.
Answer:
Global warming is a term which deals with increasing in the temperature of the earth due to the effect of various green house gases like(methane,carbon dioxide,carbon mono oxide
Explanation:
it destroy the depletion of ozone layer .As a result sun rays directly fall on earth which warm the earth rapidly(increasing temperature).
Answer:
The correct answer is - involuntary contraction of the skeletal muscles.
Explanation:
Shivering or the chills that is involuntary action of body to maintain the homeostasis by controlling the body heat or maintaining body temperature it can cause by environmental change or the infection.
It is rapid involuntary contraction and relaxation of the skeletal muscles whenever body needs to produce heat when ti feels cold. Skeletal muscles are act as thermal effector in such cases.
Thus, the correct answer is - involuntary contraction of the skeletal muscles.
<span>The “fossil record had caused Darwin more grief than joy. Nothing distressed him more than the Cambrian explosion, the coincident appearance of almost all complex organic designs,” according to Stephen Gould in the book entitled The Panda’s Thumb</span>
They're strong and are good at keeping the sea out long-term, however they're really expensive