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Sidana [21]
3 years ago
15

Would strontium-90 be useful for determining the age of fossils

Biology
1 answer:
netineya [11]3 years ago
4 0
False. Strontium 90 has a half life of only 30 years, and as millions of years pass, about the time fossils have been around, most if not all of any strontium would have decayed.
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Which diagram best represents the cycling of respiratory and photosynthetic gases in green
Sedbober [7]

Answer:

The correct answer is - option D.

Explanation:

In algae or any other photosynthetic organism, there is the internalization of carbon dioxide gas in the reaction with water in the presence of sunlight to produce sugar molecules and oxygen gas in the atmosphere. So, photosynthesis is the process that releases or produces oxygen gas.

In cellular respiration (aerobic) the product of photosynthesis, glucose molecules, and oxygen react to produce the energy and releases carbon dioxide and water as byproducts.

So, the correct answer is - option D.

6 0
3 years ago
Chemicals that regulate many body functions are _____.<br> adrenals<br> hormones <br> enzymes
Lady bird [3.3K]

the answer is hormones.

4 0
3 years ago
Read 2 more answers
Explain how the random alignment of homologous chromosomes during metaphase I
borishaifa [10]

The randomness in the alignment of recombined chromosomes at the metaphase plate, coupled with the crossing over events between nonsister chromatids, are responsible for much of the genetic variation in the offspring. To clarify this further, remember that the homologous chromosomes of a sexually reproducing organism are originally inherited as two separate sets, one from each parent. Using humans as an example, one set of 23 chromosomes is present in the egg donated by the mother. The father provides the other set of 23 chromosomes in the sperm that fertilizes the egg. Every cell of the multicellular offspring has copies of the original two sets of homologous chromosomes. In prophase I of meiosis, the homologous chromosomes form the tetrads. In metaphase I, these pairs line up at the midway point between the two poles of the cell to form the metaphase plate. Because there is an equal chance that a microtubule fiber will encounter a maternally or paternally inherited chromosome, the arrangement of the tetrads at the metaphase plate is random. Thus, any maternally inherited chromosome may face either pole. Likewise, any paternally inherited chromosome may also face either pole. The orientation of each tetrad is independent of the orientation of the other 22 tetrads.

Explanation:

3 0
3 years ago
11. Which of the following is NOT true? • ATP is formed during both photosynthesis and cellular respiration • Both plant cells a
Lina20 [59]
The third one is incorrect.
A plant releases oxygen during photosynthesis not carbon dioxide.
Hope this helps.
6 0
3 years ago
The process by which cells are drawn or attracted to an area by a microbe invader is known as ________.
Alexxx [7]

Answer:

chemotaxis

Explanation:

Chemotaxis is movement of the organism in the response to the chemical stimulus.

Bacteria, somatic cells and single-cell as well as multicellular organisms direct  movements of their body according to some chemicals in the environment. This is very important for the bacteria to find the food by swimming toward highest concentration of the food molecules or also to flee from the poisons.

<u>Thus, it is a process by which various cells are drawn to the target area by a microbe invader.</u>

7 0
3 years ago
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