1. Which of the following statements are related to vein, artery or capillary. 1.1 Have a flaccid opening.
1.2 Carry blood under low pressure.
1.3 Form networks at organs and tissues.
1.4 Carry blood from the heart to organs. [2]​

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million