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Vladimir79 [104]
3 years ago
11

Which of the following elements has the highest atomic mass?

Biology
2 answers:
Arte-miy333 [17]3 years ago
4 0
I think is C
I hope it’s correct
Lady bird [3.3K]3 years ago
3 0
I think its A but I'm not sure. 
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Which phrase describes organisms that formed index fossils?
HACTEHA [7]

Answer:

Have hard parts

Were generally large

Lived in a narrow range of geographical area

Are extinct

Explanation:

4 0
3 years ago
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Epinephrine initiates a signal transduction pathways that produces cyclic AMP (cAMP) and leads to the breakdown of glycogen to g
vladimir1956 [14]

Answer:

The ability of caffeine to inhibit adenosine receptors, plays a very important role in heightened alertness and sleeplessness.

Explanation:

"<em><u>Caffeine</u></em>" (<em>1,3,7-trimethylxanthine</em>) is an alkaloid obtained from plants. It has a chemical formula of C8H10N4O2.

Caffeine is generally <em>hydrophillic</em> but sufficiently <em>lipophilic</em> to pass through all biological membranes and readily cross the blood-brain barrier.

Therefore can bind with the adenosine receptors. Due to the blocking of adenosine inhibitory effects through its receptors held by paraxanthine and caffeine, it indirectly affects the release of <u>norepinephrine, dopamine, acetylcholine, serotonin, glutamate</u> e.t.c.

The release of the above-mentioned hormones have a great impact on the heightened alertness of the body, especially <em>dopamine</em> and <em>serotonin</em>.

8 0
3 years ago
How do whales,bats,and dolphins use echolocation.
zvonat [6]

B. To orient themselves and to find food

Since they cannot see very well or even at all in some cases, these animals use echolocation instead to orient themselves, to find where they are, and to find food.

7 0
3 years ago
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A plant breeder has determined the following variances for yield of corn in his fields:
Law Incorporation [45]

Answer:

A. VG = 80

B. Broad sense heritability = 0.80

C. Narrow sense heritability = 0.30

D. Average yield = 430 Units

Explanation:

A. Given that

VA = 30

VD = 50

VI = assumed not available

Therefore

Total genetic variance (VG) = VA + VD

= 30 + 50

= 80

VG = 80

B. Given that

VP = 100

VG = 80

Broad sense heritability, H2 = VG/VP

= 80/100

= 0.80

C. Given that

VA = 30

VP = 100

Narrow sense heritability, h2 = VA/VP

=30/100

= 0.30

D. The difference in selection = 500 - 400

= 100

Recall,

Selection response is heritability multiplied by selection differential.

That is

R = h2S

Selection differential = 100

Heritability h2 = 0.30

Selection response = 0.30 × 100

= 30units

Therefore, expected average yield = 400 + 30

= 430 Units

6 0
3 years ago
Who is most at risk of spinal cord injury because of preexisting degenerative disorders?
miskamm [114]

Elderly people are most at risk from minor trauma that results in serious spinal cord injury because of preexisting degenerative vertebral disorders. Males are more prone to spinal cord injuries than females but not as a result of preexisting disorder. This may be related to an increased involvement in contact sports or a propensity to participate in high risk activities. Neither females nor infants are at any particular risk for spinal cord injuries.






6 0
3 years ago
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