Answer:
Cambrian explosion, the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period. The event was characterized by the appearance of many of the major phyla (between 20 and 35) that make up modern animal life
Explanation:
You can control time in a experiment EX: say you let a plant sit in the sun for 5 hours and then let another plant sit for an entire full 24 hours and see what's the effect well what you controlled there was the time and your dependent variable would be what ever happened to that plant. so you can control time and you can control speed if its an object that acquires you to exert force.
Data are usually used to organize the information graphs are created from data tables they allow the investigator to have a image of their observations they can always see what they recorded on their graphs and tables thats mainly the reason why just to be organized!!
Properly identifying each species.
Accurately recording his findings.
Not interfering with ecosystem while studying the birds.
Answer:
Hey mate.....
Explanation:
This is ur answer....
<em>A food web is a more realistic way of portraying an ecosystem than a food chain because food chains imply that organisms only eat one type of organism which is rarely true. In a food chain predators occupy higher levels than their prey. Food webs are more complicated diagrams that are not purely linear.</em>
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