Answer:
In bryophytes, the sporophyte is minute and dependent on the relatively prominent and nutritionally independent gametophyte for resources. The moss gametophyte looks like a miniature herb, with tiny leaf-like photosynthetic organs. The gametophyte generation begins as a dormant spore, which germinates under appropriate conditions to produce filamentous and branching protonemal tissues. These form multicellular bud-like structures, each of which develops into a leafy shoot. The mature gametophytes produce male and female sexual organs, the antheridia and archegonia, respectively. The gametophyte is often sexually distinct, and plants are either male or female.
Each antheridium has an outer layer that encloses and protects thousands of motile sperm, which swim through available external water layer to the egg. Fertilization at the base of the cylindrical archegonium produces a diploid zygote which develops into an unbranched sporophyte. The sporophyte consists of a thin stalk attached to the gametophyte, and a capsule that encloses the sporophytic meiotic cells.
In recent years, the mosses Physcomitrella patens and Funaria hygrometrica have emerged as attractive model systems for studying gene function in non-vascular plants because of the relative ease of molecular manipulation by homologous recombination. Mutants affecting gametophyte development have been isolated and their analysis should provide insights into the molecular basis of gametophyte development in mosses.
Explanation:
Answer:
Energy is lost at several levels from the body of an organism. Two of the phenomenons through which energy is lost are
Conduction:
When a body is in contact with another body, energy is lost in the form of heat. For example, if we sleep on a cold floor, energy from our body would be lost to the floor in the form of heat,
Decomposition:
Energy is lost when cells in a body die and energy is required for decomposition also.
The hemi
metabolism<span> indicates the three distinct
stages of the life cycle of some insects: the egg, nymph, and the adult stage,
or imago. It has no pupal stage just like the complete metamorphosis that
undergoes pupal stage before turning into adult. Insects that undergo hemi metabolous metamorphosis go through gradual changes; develop from
eggs into nymphs sometimes called larvae by some entomologists, that are
similar in shape to the adults. You can
distinguish the nymphs from the adults by looking for wings. Wing buds
or wing pads may be present in late stage nymphs, but they are fixed in place
against the body and are non-functional compared to the adults whose wings are
fully developed. </span>
2: D 3: A 4: B 5:A 6:C PLEASE MARK BRAINLIEST!!
Im not 100% sure but the best answer I can give is Prokaryotes because they came to be around the time oxygen did as well.
