Lymph. Lymph is a fluid that circulates throughout the body in the lymphatic system. It forms when tissue fluids/blood plasma (mostly water, with proteins and other dissolved substances) drain into the lymphatic system. It contains a high number of lymphocytes (white cells that fight infection).
The correct answer is: d) begins later in life
Eggs or female reproductive cells are formed well before birth in a huge number (primordial oocytes). But, the number of oocyte decreases after birth constantly (there are 2 million oocytes at birth and 40,000 of them in puberty). At menopause, no egg cells are left.
On the other hand, the first sperms are formed only from puberty, but the production of those cells never stops.
Answer:
Another essential characteristic of vascular plants is that the principal generation phase in these plants is the sporophyte phase where they produce diploid spores. Vascular plants are tall and large in size compared to the non-vascular plants because of their ability to transport necessary substances to all parts of the body via vascular tissue.
Explanation:
The following events will be catastrophic to an ecosystem:
1. Al volcanic eruption
2. An oil spill and
3. The introduction of a species that reproduce quickly.
A volcanic eruption will disrupt both the plants and the animal activities in a particular ecosystem and lead to loss of habitation. Depending on the extent of the volcanic eruption, a whole ecosystem can be completely wipe out. An oil spill is very poisonous to aquatic ecosystem and it leads to the death of the organisms that live in the water. Introducing a specie that reproduce quickly into an ecosystem will lead to fast taking over of the ecosystem by that specie to the detriment of other species.