Which of the following appeared during the mesozoic era?
a. birds
c. mammals
b. dinosaurs
d. all of the above

Answer;

-All the above

-Birds, mammals and Dinosaurs, all appeared during the Mesozoic Era.

Explanation;

-The Mesozoic Era was an Era that lasted for about 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous.

-During this time, many modern forms of plants, invertebrates, and fishes evolved. On land, dinosaurs were the dominant animals, while the oceans were populated by large marine reptiles, and Pterosaurs ruled the air.

-It is said that birds are a group of theropod dinosaurs that originated during the Mesozoic Era. The first mammals evolved from a population of vertebrates called therapsids, at the end of the Triassic period and coexisted with dinosaurs throughout the Mesozoic Era.

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.