Answer:
Hydras
Explanation:
Algae support hydras because they provide hydras oxygen. Hydras have regenerative ability; they do not appear to die of old age, or to age at all. But sometimes, disease, predators and water contamination kill off hydras before they can achieve "immortality".
Jellyfish need to stay in the water to survive. They get their oxygen from their really thin skin. In some cases, it has been found that jellyfish have an immune system that presents bacterial-specific responses.
In the absence of an adaptive immune system, Hydra polyps employ an elaborate innate immune system to detect and interact with microbes using their two cell layers as efficient defense barriers, making them survive longer or have better defense against the chemicals.
Also take into consideration, what chemicals/acids are being put into the lake and the "age" of the hydra/jellyfish.
Answer: The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products that do not belong in the nervous system or even body.
Explanation:
<span>Certainly. Every organism has a variety of different characteristics. One person writing a key might choose to use different characteristics than another person would use.
For example: Here's a key for separating fish, snake, frog and mouse
1.
A. Has scales on its skin ... 2
B. Has no scales on its skin ... 3
2.
A. Breathes with gills - fish
B. Breathes with lungs - snake
3.
A. Has hair or fur - mouse
B. Has no hair or fur - frog
Here's a different key for the same four animals:
1.
A. Has four legs ... 2
B. Does not have 4 legs ... 3
2.
A. is warm-blooded - mouse
B. is cold-blooded - frog
3.
A. has fins - fish
B. has no fins - snake</span>
two big R and two little r should be 50
Answer:
A nerve produces a response on the opposite side from where it is coming then the response is called contralateral and if the nerve produces a response on the same side from where the nerve is coming then the response is called as ipsilateral.
Explanation:
