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Whitepunk [10]
3 years ago
11

What type of evolution occurs when species split off from a common ancestor?

Biology
2 answers:
hoa [83]3 years ago
6 0
Speciation, when populations evolve to become distinct species
sleet_krkn [62]3 years ago
4 0
Differences in species occur when there is temporal, geographical, behavioral, and or mechanical isolation. Over time the groups diverge from each other and become so different that they can no longer reproduce with each other. This is called divergence. The process of creating the two new species is called speciation.
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Precapillary sphinctersa. serve as valves in veins. b. are found in the tunica media. c. carry blood under high pressure. d. con
KengaRu [80]

Answer:

D. Control the blood flow into the capillary bed

Explanation:

The degree of filling of the capillary bed and level of arterial pressure within the vascular system is determined mainly by the degree of tonus (firmness) in the smooth muscle of the arterial wall. Arterioles have relatively narrow lumina, thick muscular wall and precapillary sphincter.

3 0
3 years ago
How does change effect an ecosystem
Nikolay [14]

Natural Changes That Can Affect an Ecosystem. Wind, rain, predation and earthquakes are all examples of natural processes which impact an ecosystem. Humans also affect ecosystems by reducing habitat, over-hunting, broadcasting pesticides or fertilizers, and other influences.

6 0
3 years ago
Vasopressin secretion is suppressed by _____________.<br><br> hormones<br><br> caffeine
guajiro [1.7K]

Answer: Antidiuretic hormone binds to receptors on cells in the collecting ducts of the kidney and promotes reabsorption of water back into the circulation. In the absense of antidiuretic hormone, the collecting ducts are virtually impermiable to water, and it flows out as urine.

Antidiuretic hormone stimulates water reabsorbtion by stimulating insertion of "water channels" or aquaporins into the membranes of kidney tubules. These channels transport solute-free water through tubular cells and back into blood, leading to a decrease in plasma osmolarity and an increase osmolarity of urine.

Effects on the Vascular System

In many species, high concentrations of antidiuretic hormone cause widespread constriction of arterioles, which leads to increased arterial pressure. It was for this effect that the name vasopressin was coined. In healthy humans, antidiuretic hormone has minimal pressor effects.

Control of Antidiuretic Hormone Secretion

The most important variable regulating antidiuretic hormone secretion is plasma osmolarity, or the concentration of solutes in blood. Osmolarity is sensed in the hypothalamus by neurons known as an osmoreceptors, and those neurons, in turn, stimulate secretion from the neurons that produce antidiuretic hormone.

When plasma osmolarity is below a certain threshold, the osmoreceptors are not activated and secretio of antidiuretic hormone is suppressed. When osmolarity increases above the threshold, the ever-alert osmoreceptors recognize this as their cue to stimulate the neurons that secrete antidiuretic hormone. As seen the the figure below, antidiuretic hormone concentrations rise steeply and linearly with increasing plasma osmolarity.

Osmotic control of antidiuretic hormone secretion makes perfect sense. Imagine walking across a desert: the sun is beating down and you begin to lose a considerable amount of body water through sweating. Loss of water results in concentration of blood solutes - plasma osmolarity increases. Should you increase urine production in such a situation? Clearly not. Rather, antidiuretic hormone is secreted, allowing almost all the water that would be lost in urine to be reabsorbed and conserved.

Explanation: hormones

8 0
3 years ago
A hypothetical population of 10,000 humans has 6840 individuals with the blood type AA, 2860 individuals with blood type AB and
kherson [118]

Answer:

750

Explanation:

According to Hardy-Weinberg equilibrium,

p + q = 1

p² + 2pq + q² = 1

where,

p = frequency of dominant allele

q = frequency of recessive allele

p² = frequency of homozygous dominant genotype

2pq =  frequency of heterozygous genotype

q² = frequency of homozygous recessive genotype

Here,

q² = BB = ( 300/10000 )

= 0.03

If the population is in HWE, next generation would also have the same frequency of BB genotype.

Number of offspring in next generation = 25000

BB blood type offspring = 0.03 * 25000 = 750

3 0
3 years ago
What are the 2 main things needed in photosynthesis process?
Paraphin [41]
Sunlight and <span>Chlorophyll</span>
5 0
2 years ago
Read 2 more answers
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