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galben [10]
2 years ago
10

A substance has a half-life of two days. If 10 days have passed, how many half-lives have the substance gone through?

Biology
1 answer:
andrew11 [14]2 years ago
6 0
It’s five isn’t it because Yk 10/2
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How many trips has Earth made around the Sun in 8 mar years
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The answer is;  15 years

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8 * 687 = 5496 days

The earth takes 365 days to orbit the sun  once. Therefore, the earth will orbit the following number of times in 8 Mar years;

5496/365 = 15.058

Which is approximately 15 years


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What is another name for colonizing lands?​
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What main idea about the nature of the cell did historical scientists disagree on?
VLD [36.1K]

Explanation:

Scientists didnt belive that there are cells untill robert hooke (1665). He observed the cells in a cork slice with the help of a PRIMITIVE microscope

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7 0
2 years ago
Members of the phyla Cnidaria and Bryozoa both have a circle of tentacles, which they use for feeding. Besides the difference in
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Answer:

C.  Cnidarian tentacles have stinging cells, but Bryozoan tentacles are covered with cilia.

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Cnidaria and Bryozoan, both teh phylum are classified under kingdom Animalia that contain aquatic animals found both in freshwater and marine environments.

They both use tentacles for feeding but there is diffference between there tentacles and feeding process.

Cnidarians tentacles are conist of stinging cells in the tips, which are called cnidocytes and a coiled thread-like stinger, called nematocyst. These stinging cells and nematocyst helps to capture and subdue prey. They feed over plankton or animals larger then them.

Bryozoan tentacles are covered with cilia and form an "O" or "U" shaped fold called lophophore, which helps to feed by sweeping the surrounding water. They generally feed on plankton, nudibranchs (sea slugs) and sea spiders.

Hence, the correct option is C.

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