Answer:
new species often appear at about the same time.
Explanation:
A biotic crisis or a mass extinction crisis is a rapid and widespread decrease in biodiversity. There is a clear change after the mass extinction, in the diversity and of multicellular organisms.
Answer:
Independent variable: different amounts of second-hand smoke
Explanation:
The independent variable in an experiment is the variable that the experimenter changes or manipulates in order to bring about a measurable response.
In this question, a test is being carried out to determine the health effects of different amounts of second-hand smoke on one-year-old hamsters. Based on this, the independent/manipulated variable is the DIFFERENT AMOUNTS OF SECOND-HAND SMOKE because it is the variable being changed.
Mitotic Spindle is structure in a cell coordinates the production of microtubules used in meiosis. It is a football-shaped structure formed of microtubules and concerted proteins which is involved in the movements during mitosis and meiosis.
<span>The vast majority of organisms within the kingdom animalia are the invertebrates and the vertebrates. These include organisms that have the ability to ingest food and movement for defense and attack. Humans are one of the organisms in the Kingdom Animalia. Hope this answer helps.</span>
