BIOLOGY MIDDLE SCHOOL

12. Jacks and silversides are a good example of an evolutionary arms race between predators and prey. Describe the predatory adaptations of the jacks, and the defensive adaptations of the silversides

Answers

Answer 1
Answer:

Answer:

Predators is an organism which can be described as the hunter who hunts for food. An d prey can be described as the organism on which the predator will feed.

Silversides can be described as small fishes which are very thin. They are usually found in fresh water or near the coastal areas.

The adaptation of the Jacks include :

  • They are fast.
  • They attack the prey in herds.

Adaptations of silverside are:

  • They have colour much transparent or like the colour of water which allows them to hide.
  • They travel in groups.

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Aquatic organisms in lakes and ponds are often able to survive the water underneath a layer of ice because the water underneath the ice remains liquid. Which property of water is primarily responsible for creating these favorable conditions for aquatic life?

Answers

Answer:

The property is that water expands when it freezes and oxygen is trapped inside

Explanation:

Underneath the frozen upper layer, the water remains in its liquid form and does not freeze. Also, oxygen is trapped beneath the layer of ice. As a result, fish and other aquatic animals find it possible to live comfortably in the frozen lakes and ponds. The oxygen is present in water under the ice and this oxygen is used for breathing by the marine and aquatic animals.

How do genes mix in humans?

Answers

In the X and Y chromosomes. 50% of your mom's genes are in the X chromosome, and 50% of your dad's in the Y.
Technically, it’s completely possible because DNA is just DNA. It doesn’t matter where it’s come from. In the lab, you can put jellyfish genes into mice, you can put human genes into bacteria, you can put worm genes into yeast. It’s all DNA. It’s all the same kind of nuts and bolts. If you put a gene in that’s kind of got the right bits and bobs, it will be expressed. That means it will be active and it will make a protein because that’s what genes do. They make little recipes that cells use to make different proteins. Now, that’s what genes do. The difficulty comes when you say, if you put certain genes into different species, would it give that species some new power? So for example say, if you put an olfactory receptor, something involved in smelling from a dog into a human, would a human be able to suddenly smell all these different things? The answer is probably no because one gene doesn’t just give a big characteristic like that. So, one gene is not responsible for super accurate sight or the smelling ability of dogs, or the hearing ability of foxes or something like that.

Examine this photograph of a bird. Note that the beak of this bird is short and very strong. What type of food is a bird with kind of beak likely to eat?A)fishB)insectsC)worms and grubsD)nuts and tough fruits

Answers

Answer:

D)nuts and tough fruits

Explanation:

Bird beaks are developed to perform their functions, they are true tools that help birds survive in their habitat.

This type of beak is seen from birds called granivores. This short beak is strong and skilled, the granivore beak has the strength to break down hard seeds, nuts and hard fruits. In addition, this type of beak has the delicacy to separate the discarded bark from the nutritious part that feeds the bird.
D- the bird most likely eats nuts because it would need a longer beak to catch fish or dig up worms or other insects.

Which of the following is true about contact forces?Question 1 options:

Contact forces only work by pushing.


Contact forces only work by pulling.


Contact forces require the physical contact between objects.


Contact forces work between two objects that do not touch.

Answers

In physics, a contact force is a force that acts at the point of contact between two objects, in contrast to body forces. Contact forces are described by Newton's laws of motion, as with all other forces in dynamics. Contact force is the force in which an object comes in contact with another object.

Hope this helps!

Select all that apply.Vectors that some protozoa use to transfer disease are _____.


ticks
flies
mosquitoes
fleas

Answers

Answer:

Flies, mosquitoes and fleas

Explanation:

Living organisms which spread infectious diseases from infected to healthy humans or from animals to humans are called vectors. Flies, fleas and mosquitos are the vectors which are used by some protozoa to transmit diseases for examples sand flies are the vectors of Leishmania, a unicellular parasitic protozoan. Plasmodium, a parasitic protozoan cause malaria which is transmitted by mosquitos.

Match the following with their proper definitions.biomass
a property capable of causing
changes in matter
a carbon-based fuel derived from
living matter that existed in prehistoric
times
the energy of a moving object
2. energy
3. fossil fuel
a material made from plants or
4. kinetic energy
animals
stored energy
5. potential energy

Answers

Answer:

fossil fuel- a carbon-based fuel derived from

living matter that existed in prehistoric

times

energy- a property capable of causing

changes in matter

kinetic energy- the energy of a moving object

biomass- a material made from plants or animals

potential energy- stored energy
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