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3 years ago

A species whose presence is critical to maintaining the ecological balance is called a/an _____ species.

Biology

1 answer:

kow [346]3 years ago

3 0

Answer:

keystone species

Explanation:

Keystone species are indispensable species that are essential to the maintaining of the balance of an ecosystem, and also play a major role in the way species in the ecosystem interrelate. The absence or removal of a keystone species from a habitat or ecosystem would lead to the disruption and imbalance of the ecosystem, and as such lead to the extinction of other species.

An example of a keystone species is the bee. Bees are very important in pollination of flowering plants and also ensure their survival. This plants serve as home to various insects that are source of food to birds. The removal of bees from this ecosystem would affect the ecological balance of this ecosystem.

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Which main plant tissue is shown in green? dermal ground vascular meristem

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Ground tissue, which is also known as cortex, is the main plant tissue shown in green in the image.

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Which of the following is a way that scientific advancements have benefited society?

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Answer: a. increased energy efficiency

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Darwin noticed the beak of finches on each Galapagos Island were slightly different and matched the food found on each island. T

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2 years ago

Each ABO blood group is associated with the presence/absence of RBC antigens and the presence/absence of antibodies in the plasm

harina [27]

Answer:

a. Type O blood - No A or B antigens on RBCs-Anti-A antibodies in plasma-Anti-B antibodies in plasma

b. Type A blood - A antigen on RBCs- Anti-B antibodies in plasma

c. Type B blood - B antigen on RBCs- Anti-A antibodies in plasma

d. Type AB blood - A antigen on RBCs- B antigen on RBCs- Neither anti-A or anti-B in plasma

Explanation:

ABO blood grouping system represents multiple allelism which was discovered in humans by Karl Landsteiner. The blood group is determined by the presence or absence of A & B antigens and antibodies.

The 4 blood groups which exist in ABO system are O, A, B and AB. Also, allele A and B are co-dominant i.e. if they both will exist on the surface of an RBC then both will be equally expressed which implies that there will be no dominant or recessive allele.

Type O blood group has H antigen on the surface of RBC and has both the antibodies i.e. antibody A and B. The absence of antigens A and B makes it a universal donor.

Type A blood group has A antigen on RBC and has antibody B in the plasma.

Type B blood group has B antigen on RBC and has antibody A in the plasma.

Type AB blood group has both the antigens i.e. antigen A and B on RBC and does not have any antibody in the plasma which makes it a universal acceptor.

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3 years ago

A sound wave with a frequency of 300 hertz is traveling through a medium at a speed of 320 meters/seconds. What is it’s waveleng

dalvyx [7]

1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,
λ = s / f = (320 m/s) / (300 1/s) = 1.07 m
The wavelength is approximately 1.07 m.

2. The frequency is the ratio between speed and the wavelength,
f = (330 m/s) / 0.45 m = 733.33 hertz

Read more on Brainly.com - brainly.com/question/1553993#readmore

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2 years ago