Answer:
These structures that protect the sponges from most predators, but not turtles, are spicules.
Explanation:
Sponges <em>skeleton</em> is composed of <em>calcium carbonate and siliceous</em> micro-structures called <u>spicules</u>. Their morphology is so varied that it is used in taxonomy for identification and classification.
There are different kinds of spicules:
- <em>Monoaxonic spicule</em>: needle-shaped, straights or curves
- <em>Tetraxonic spicules:</em> they have four prolongations
- <em>Triaxonic or Hexaxonic spicules</em>
- <em>Poliaxonic spicules </em>
Two terms can be applied to any of these spicules kinds:
- <em>Megaspicules</em>: They are elongated and compose the main architecture of the sponge skeleton
- <em>Microspicules</em>: Variable in shape and size, with ancillary functions
Sponges have few predators thank to the spicule structures and their high toxicity. Many of them are capable of perforating soft tissues and producing urticant substances.
<h2>Human Reproductive System</h2>
Explanation:
- The most <em>Flowering plants</em> have a distinctive element is their <em>reproductive organs, ordinarily called flowers</em>
- Sexual propagation in flowering plants includes the develop of <em>female and male gametes</em>, the exchange of the <em>male gametes to the female ovules in a process called pollination</em>
- The part of reproductive plant organ,the flower contain pistil <em>(female flower part) and stamen (male flower part),or plus accessory part such as petals,sepals and nectar gland</em>
- The stamen is the male reproductive organ. It consists of a <em>pollen sac (anther) and a long supporting filament</em>
Sounds of silence hope this helps
<u>Answer</u>: Hybridization.
Hybridization is the process through which two species can mate with each other and produce fertile offspring thus creating a new species.
This is not happening with the two palm species on the island. This may be due to prezygotic barriers that prevent these two species from mating and producing a zygote (fertilized egg cell). In essence these barriers prevent any gene flow between the two species.